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Egg in Vinegar Experiment – Make a Rubber Egg
The egg in vinegar experiment is a fun way of learning about egg structure, chemical reactions, osmosis, and the scientific method . It’s a safe and non-toxic project, so it’s perfect for young investigators. Other names for the egg in vinegar experiment are the naked egg, rubber egg, or bouncy egg. The “naked” part is easy to understand, because you’re removing the shell from the egg using chemistry. The “rubber” or “bouncy” description implies the egg bounces rather than breaks. Does it work? You be the judge!
The Chemistry of the Egg in Vinegar Experiment
Vinegar contains acetic acid (CH 3 COOH), which is a weak acid . Egg shells are calcium carbonate (CaCO 3 ). Acetic acid reacts with calcium carbonate, making calcium acetate and carbon dioxide. Here is the balanced chemical equation for the reaction:
2 CH 3 COOH(aq) + CaCO 3 (s) → Ca(C 2 H 3 O 2 ) 2 (aq) + H 2 O(l) + CO 2 (g)
The calcium acetate dissolves in water, while the carbon dioxide is a gas and forms bubbles. So, the egg shell dissolves and bubbles away, leaving a naked egg.
What You Do
All you need for this project is an egg, vinegar, and a cup:
- Cup large enough for the egg
- Food coloring (optional)
Use either a raw egg or hard-boiled egg. The advantage of using a raw egg is that you can see into the inside of the egg when you are done. The advantage of using a hard-boiled egg is that it bounces after pickling in the vinegar. The raw egg bounces a bit too, but if you use too much force it breaks open and makes a mess.
- Place the egg in a cup.
- Pour vinegar over the egg until it is just covered. It’s okay if the egg floats a bit. If you like, add a few drops of food coloring. After about 15 minutes, observe the bubbles forming around the egg. The bubbles are carbon dioxide gas. They form from the chemical reaction between the acetic acid in the vinegar and the calcium carbonate of the egg shell. You may also feel that the cup is slightly warm. The reaction is exothermic, meaning it gives off heat. The bubbles and temperature change are two signs of a chemical change .
- Wait a day. Also note that the liquid becomes cloudy or scummy. This is the dissolving egg shell.
- If you remove the egg after 1 day, use a spoon. Otherwise, a raw egg easily ruptures. At this point, if you remove the egg, you can easily rinse away any remaining shell. But, you get better results if you pour off the liquid and add fresh vinegar. This is especially true if you want a rubber egg or bouncy egg. Wait another day or two, giving the vinegar time to get all the way into the egg.
- Remove the egg and rinse it off using water.
Why Rotten Eggs Float in Water
Learn the scientific reason why bad eggs float in water, while good eggs sink.
Science Experiments to Try
Now that you have a rubber egg, what do you do with it?
- Examine the internal structure of the egg. This only works if you started with a raw egg and not a hard-boiled one. Identify the egg membrane, yolk, egg white (albumin), and chalaza.
- Compare the egg without its shell to a normal egg. Notice that the egg soaked in vinegar is slightly larger than the egg with its shell. Why is this? The reason is because water entered the rubber egg via osmosis . The concentration of salts, proteins, and other molecules inside the egg is greater than the concentration in the cup. The egg membrane is semipermeable. It allows the movement of water, but not larger molecules. So, the egg swells with water to try to dilute the inside of the egg so it has the same concentration and outside of the egg. Experiment : Predict what happens if you soak the rubber egg in corn syrup, salt water, or sugar water. Compare the size of this egg with a normal egg and a rubber egg. Corn syrup, salt water, or sugar water shrink the egg because the liquid is more concentrated the interior of the egg. Here, water leaves the egg via osmosis.
- Try bouncing the egg. In addition to dissolving the egg shell, vinegar also pickles the egg. It changes the conformation of protein molecules in the egg white. Because vinegar has a low pH, it also helps preserve the egg. Experiment : Compare how well a rubber egg bounces depending on whether you started with a raw egg or hard-boiled egg.
Can You Eat the Egg?
Eating an egg after soaking it in vinegar is not a great plan. First, it won’t taste great. Second, it could make you sick. If you must eat your experiment, soak a hard-boiled egg in vinegar in the refrigerator for a few days.
Does the Egg in Vinegar Smell Like Rotten Eggs?
Mostly, the egg comes out of this project smelling like vinegar. Vinegar pickles the egg, which preserves it. But, once you remove the egg from vinegar it starts decomposing. After enough time, if you break the egg, it will stink. The odor comes from hydrogen sulfide gas, which is a product of the decomposition reactions in the egg.
Of course, if you start the project with a rotten egg, all bets are off. Rupturing the membrane releases any trapped gases. Bounce these egg with care!
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Egg and Vinegar Experiment: How-To Plus Free Worksheet
It’s so easy you’ll want to do it again and again.
You and your students are going to love the Egg and Vinegar Experiment. It’s an easy project you can complete in a few days, and it makes a good science fair experiment too. We asked 3rd grader Hazel from Baltimore, Maryland, to help us put this one to the test, and she did a great job. Be sure to check out her video for step-by-step instructions, and then keep reading to learn how to do the experiment on your own.
Also grab your free, printable Egg and Vinegar Experiment recording sheet when you fill out the form on this page.
How does the Egg and Vinegar Experiment work?
The Egg and Vinegar Experiment, also known as the “Naked Egg Experiment,” demonstrates osmosis. Placing an egg in vinegar triggers a reaction between the eggshell’s calcium carbonate and the vinegar’s acetic acid, producing carbon dioxide bubbles. As the acetic acid dissolves the eggshell over time, the semi-permeable membrane remains, permitting water molecules to enter via osmosis. This influx causes the egg to swell.
Check out this video tutorial of the experiment, featuring 3rd grader Hazel:
How do you do the experiment?
First, get your materials together..
You’ll need an egg, a graduated cylinder, and white vinegar.
Put your egg in the vinegar.
Pour white vinegar into a graduated cylinder. Fill it high enough so that your egg will be completely submerged. Gently add your egg.
Observe the egg.
Keep an eye on it for a couple of days to notice the changes. Then after a few days, you can remove the egg from the graduated cylinder.
Examine the results.
Pour out the vinegar and give your egg a gentle rinse. You can try bouncing the egg. Also take time to look for the yolk inside.
Break the egg.
After you’re done examining the egg, try breaking it to find the yolk. This will also help you find the egg’s membrane.
What does the Egg and Vinegar Experiment teach?
This experiment teaches several important scientific concepts: ADVERTISEMENT
Students learn about the movement of water molecules across a semi-permeable membrane from an area of high concentration to an area of low concentration. In this case, water moves from the vinegar solution into the egg.
Chemical reactions
Students observe a chemical reaction between calcium carbonate (present in the eggshell) and acetic acid (present in the vinegar), leading to the dissolution of the eggshell.
Structure and function
By removing the eggshell, students can observe the structure and function of the egg’s semi-permeable membrane, which allows certain molecules to pass through while restricting others.
Experimental procedure
Students gain experience in following a step-by-step experimental procedure, making observations, and drawing conclusions based on their observations.
Can this experiment be done for a science fair?
Absolutely! The Egg and Vinegar Experiment is not only educational but also visually captivating, making it an excellent choice for a science fair project. Students can explore variations of the experiment by changing variables such as the concentration of vinegar, the duration of immersion, or the temperature of the vinegar solution. Additionally, they can research the scientific principles behind the experiment and present their findings in a clear and engaging manner. Overall, this experiment offers a hands-on opportunity for students to learn about osmosis and chemical reactions while showcasing their creativity and scientific inquiry skills at a science fair.
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Egg in Vinegar Science Experiment – How to Make a Bouncy Egg
Hold on to your eggs because this egg in vinegar science experiment might have your kids bouncing along with these bouncy raw eggs. Kids will discover how a chemical reaction can dissolve what seems solid into something that feels more like a bouncy ball!
Watch the video, print out the instructions, then try it for yourself. Our simple scientific explanation helps kids see and feel the results of chemical reactions while learning how it works.
JUMP TO SECTION: Instructions | Video Tutorial | How it Works
Supplies Needed
- Glass or Jar
Bouncy Egg Science Lab Kit – Only $5
Use our easy Bouncy Egg Science Lab Kit to grab your students’ attention without the stress of planning!
It’s everything you need to make science easy for teachers and fun for students — using inexpensive materials you probably already have in your storage closet!
Egg in Vinegar Science Experiment Instructions
Experiment Setup – Start with some observations about the egg. Explain that it is a raw egg and that that the shell is fragile and can easily be cracked. Demonstrate this with another egg. Then ask some questions. Does it seem possible that we can get the egg to bounce? Next observe the supplies for the experiment. What do you think will happen if you put the egg in vinegar? Write down your hypothesis (prediction) and then follow the steps below.
Step 1 – Get a raw egg and carefully place it into a glass or jar. Then fill the glass with white vinegar until the egg is completely submerged.
Step 2 – Leave the egg in the glass for 2-3 days. Each day, check back on the egg. Make some observations. Do you notice any changes to the egg? Is anything happening to the vinegar? Write down your observations each day. After about 3 days the egg will start to become translucent and you will know it is ready to move to step 3.
Step 3 – Carefully remove the egg from the glass and rinse it under some tap water. While rinsing the egg, gently rub the outside of the egg and the white film will come off leaving you with a translucent egg. Examine the egg and make some observations. Does the egg look different from when you started the experiment? Does the egg feel different? Perhaps you notice that it feels rubbery (like a bouncy ball). Write down your observations.
Step 4 – Over a plate or other container, lift the egg 1-2 inches in the air, let go, and watch it bounce. Make some observations. What happens to the egg? Does it bounce? Is this different than what you expected?
Step 5 – When you are ready for some messy fun, lift the egg a little higher in the air and let it go…SPLAT!
Wondering what caused the egg to bounce? Find out the answer in the how does this experiment work section below.
Video Tutorial
Watch the Bouncy Egg in Vinegar Science Experiment Step by Step Instructions
How Does the Bouncy Egg Science Experiment Work
The egg becomes bouncy as a result of a chemical reaction between the eggshell and the vinegar. The eggshell of a chicken egg is made of calcium carbonate, and vinegar is a weak acid. If you’ve ever mixed baking soda and vinegar together, you know the violent reaction that results. The calcium carbonate that makes up the eggshell will react with the vinegar the same way baking soda reacts with vinegar (just a lot less violently). You know the vinegar and calcium carbonate of the eggshell are reacting because of the small bubbles that form around the egg when it is placed in the vinegar. These small bubbles are carbon dioxide gas, which are the result of the reaction between calcium carbonate and vinegar.
Once the shell of the egg is gone, all that is left covering the egg is a thin membrane. The vinegar begins working on the egg’s membrane. The membrane of a chicken egg is selectively permeable . The vinegar is able to cross the selectively permeable membrane of the egg through osmosis . The vinegar toughens up the membrane of the egg making it bouncy!
The selectively permeable membrane of the egg means that some substances can pass through the membrane while others cannot. Osmosis is the diffusion of solvent molecules through a selectively permeable membrane.
Other Ideas to Try
Try other acids like lemon juice. Does it have the same effect on the eggshell? Try other types of eggs – white vs. brown shells, regular vs. organic eggs, maybe you can even find some unusual egg types at your local grocery store to experiment with (turkey, duck, quail eggs).
I hope you enjoyed the experiment. Here are some printable instructions:
Bouncy Egg Science Experiment
Instructions.
- Get a raw egg and carefully place it into a glass or jar. Then fill the glass with white vinegar until the egg is completely submerged.
- Leave the egg in the glass for 2-3 days. Each day, check back on the egg. Make some observations. Do you notice any changes to the egg? Is anything happening to the vinegar? Write down your observations each day. After about 3 days the egg will start to become translucent and you will know it is ready to move to step 3.
- Carefully remove the egg from the glass and rinse it under some tap water. While rinsing the egg, gently rub the outside of the egg and the white film will come off leaving you with a translucent egg. Examine the egg and make some observations. Does the egg look different from when you started the experiment? Does the egg feel different? Perhaps you notice that it feels rubbery (like a bouncy ball). Write down your observations.
- Over a plate or other container, lift the egg 1-2 inches in the air, let go, and watch it bounce. Make some observations. What happens to the egg? Does it bounce? Is this different than what you expected?
- When you are ready for some messy fun, lift the egg a little higher in the air and let it go…SPLAT!
Reader Interactions
October 8, 2017 at 5:08 pm
this website was extremely helpful
December 13, 2017 at 8:42 am
January 28, 2018 at 3:22 am
How long should I wait accurately to turn the egg bouncy
March 13, 2018 at 11:54 pm
You need to wait at a minimum of two days before bouncing the egg.
October 1, 2018 at 8:17 pm
Hi you have to wait for a maximum of 1-3 days till it bounces.
December 5, 2018 at 12:18 am
April 18, 2018 at 9:55 am
thank you for this useful information guys. always fun to get my hands messy and do a science experiment with with reuban and max 🙂
May 16, 2018 at 6:09 pm
my daughter did this for her science fair project and she left it in for 24 hours and it was perfect
November 12, 2018 at 8:47 pm
We think the calicium on the egg shell dissolves with the vinegar which is an acid.
Are we correct?
December 18, 2018 at 9:42 am
This is so cool.
January 8, 2019 at 8:22 am
Thanks! It helped me a lot for my science project at school!
January 27, 2020 at 4:13 am
Can you add food colouring? ??
February 3, 2023 at 12:32 pm
Yes you can, when i did this experiment in class we did food coloring and highlighter and we made glow in the dark and colored eggs.
February 25, 2020 at 5:12 pm
The acid from the vinegar made the elasticity in the egg.
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Egg In Vinegar (Rubber Egg) Experiment
Find out why this rubber egg or bouncy egg experiment is a classic must-try science activity you can set up in minutes in the classroom or at home! How can you make an egg bounce? What happens to the shell? Does light pass through it? All science experiments should be exciting, easy, and fun!
Egg In Vinegar Experiment
💡 This experiment is quick to set up, but it must be left for 48 to 72 hours to dissolve the shell and create a bouncy egg!
- Household Vinegar
- Jar or a Vase
STEP 1: Place an egg in the jar and cover with vinegar.
Optional: You can color the vinegar with food coloring for rainbow-colored rubber eggs too!
STEP 2: Wait and watch!
Notice the bubbles on the eggshell! The acid in the vinegar reacts with the calcium carbonate in the shell. This reaction produces a gas called carbon dioxide!
STEP 3: After 48 hours, remove the egg and rinse it off. Ours had a layer of brown scum that was easily washed away!
The hard outer shell is gone and the egg white and yolk are surrounded by a thin membrane.
Why Does An Egg Become Bouncy In Vinegar?
Eggshells get their hardness from a mineral called calcium carbonate similar to our bones. When you place the egg into the vinegar, you will observe bubbles.
These bubbles or gas are produced because of the chemical reaction between the vinegar (an acid) and the calcium carbonate (the base) in the eggshell.
When an acid and a base mix, they form carbon dioxide, a gas. Learn more about acids and bases.
The eggshell breaks down, leaving a soft, bendable, squeeze-able, rubber egg. Does it bounce? Kids can gently squeeze the egg and bounce the egg. However, be prepared for the eggs to burst! See our suggestions below.
Try our seashells in vinegar experiment for another variation of this chemistry lesson.
How does osmosis work?
You may have noticed that the egg gets larger as the shell disappears. The process of osmosis is the reason the inside of the egg increases in its size!
Osmosis is the movement of water through a semi-permeable cell membrane. The water from the vinegar moved inside the egg because of the tiny holes in the membrane.
However, the holes are not big enough to allow the egg to come out, so now the egg and water are inside the cell membrane together! The cell membrane is called semi-permeable because only some materials can pass through. Learn more about osmosis here!
FREE Printable Science Activities Calendar
Fun Things To Do With Your Rubber Egg
Now for the fun part: exploring the naked egg with students! We gathered a few supplies such as a magnifying glass and a large flashlight. However, first, we talked about what our naked egg felt and looked like. We had made a cool, rubbery feeling egg!
💡 TIP: Help your child learn to explore by asking questions to spark curiosity!
All of these questions encourage exploration and hands-on learning. Have kids use their senses to observe ! What does it smell like? What does it look like? There are so many ways to explore. Grab the magnifying glass too!
Can an egg bounce?
Yes!! How high can an egg bounce?
TEST IT: How high can your egg bounce before it breaks? Watch out! This might get messy!
Can you see through an egg?
In general, you can’t see through a raw egg but what about a rubber egg? What happens when you put the naked egg up to a flashlight?
TEST IT: You can see through it! You can even see the yolk rolling around inside. Why is this? Because the hard outer shell is no longer there, you can see through the membrane of the egg.
Will a rubber egg eventually burst?
Of course, we were prompted to wonder what would happen if you burst the naked egg. WOW! With a quick prick from a skewer, the egg burst! We were all quite surprised. The images below show what the naked egg looked like afterward.
Turn It Into An Bouncy Egg Science Project
This basic version below is perfect for younger kids. It includes the right amount of play and learning . For older kids, apply the scientific method by using variables . For example…
- Eggs – Are there differences in eggshells between brown and white eggs? How about organic eggs versus regular eggs?
- Liquid – What happens when you put the rubber egg back in vinegar or another liquid? How about corn syrup? Test different liquids and explore osmosis once the shell is dissolved!
Want to turn this fun science experiment into a science project? Then check out these helpful resources.
- Easy Science Fair Projects
- Science Project Tips From A Teacher
- Science Fair Board Ideas
More Fun Science Experiments To Try
- Take egg drop STEM challenge
- See if you can make an egg float
- Test the strength of the shell
- Make a crystal eggshell .
- Set up a potato osmosis lab.
- Dissolve a seashell!
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my my bursted my rubberr egg im very upset
is this a fair test?
too many pages to print out….not easy to be able to do .keeps saying click below but get the cards on hypothesisi…dont want that
This is an awesome activity.
This was amazing! in the end it turned out great! my sister popped it tho :c
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Written by Brenda • Jan 30, 2024 • Leave a Comment
Easy Egg in Vinegar Experiment
One of our favorite science experiments to do at home with kids is the egg in vinegar experiment! This rubber egg science experiment is a lot of fun for kids of all ages and it is a highly visual science experiment that is exciting for kids. Keep reading to learn how to do the experiment and to read about the science behind the egg in vinegar experiment!
Be sure to check out my Fizzy Egg Dyeing Science Experiment – The Best Way To Dye Easter Eggs as well!
Follow along with these directions to learn how to make a rubber egg!
All the details on how to complete the naked egg experiment from start to finish are listed below, including supplies too.
Here is what you need to complete this science experiment:
- Regular eggs (raw white eggs)
- White Vinegar
- Clear cup, mason jars, or other container (plastic or glass will both work)
What happens when you put eggs in vinegar?
This is what this simple experiment is going to show! The combination of the vinegar with the raw eggs and water is nothing sort of “magic”. This is one activity that does an amazing job of combining learning and fun in a way that will keep the kids engaged and ready for more.
Video of the rubber egg experiment
The science behind the naked egg science experiment.
When you place a raw egg in vinegar, the shell will dissolve overnight, exposing the membrane of the egg and the yellow yolk inside the egg.
The shell dissolves because of the acidic nature of the vinegar which triggers a chemical reaction with the shell of the egg.
Eggshells are made from calcium carbonate, which is a base. The acid in the vinegar (acetic acid) reacts with the calcium and breaks down the eggshell overnight. The acid in the vinegar reacting with the calcium carbonate in the shell produces Carbon Dioxide gas (co2.)
After the shell dissolves, the membrane of the egg remains. This is called a “semipermeable membrane” because the membrane can absorb some water.
Have the kids compare the size of the naked eggs with a shelled egg to see how the membrane absorbed some of the water from the vinegar and became larger.
The flow of water through a semipermeable membrane is called “osmosis.”
Directions for the Egg Soaked in Vinegar Experiment
Place 1-3 eggs in a clear container. Be careful not to crack the eggshell or the experiment might not work properly.
Pour enough vinegar over the eggs to cover them. You can add food coloring to the vinegar if you like.
Place the solution in an out-of-the-way place. While the egg sits in the vinegar some of the water in the vinegar will travel through the egg’s membrane
Check on the eggs in about one hour. You should see bubbles forming on the outside of the shell.
At the end of the day, stir the eggs gently with a spoon to help release the shell from the egg.
The next day, check on the eggs. The shell will appear as scum on the top of the vinegar.
Take out the egg and inspect it. You may have to gently rub it to remove the last bit of the shell.
If the shell comes off easily, the egg is ready to inspect. If not, put it back in the vinegar and remove it the following day.
Rinse the egg carefully with cool water to remove any shell residue.
Another variation on how to do the activity:
- Place the egg in vinegar
- After 24 hours change the vinegar. Drain the old vinegar carefully then add the fresh vinegar.
- Place the egg in vinegar in the refrigerator untouched for 7 days. After 7 days, pour off the vinegar, rinse the egg, and the shell will be gone. All you will be left with are naked eggs.
Inspect the egg under bright lighting to see the parts of the egg. Gently squeeze the egg to test the strength of the membrane!
The kids will love this rubber egg experiment! We also refer to this as our bouncy egg experiment because it does have a little bit of bounce to it, too!
What to do with the rubber egg
Do a bouncing eggs chemistry experiment. Can your rubber egg bounce?
Try placing your naked egg in a glass filled with corn syrup. The egg will shrivel up. The reason for this is that corn syrup has a lower concentration of water than the egg does. The water in the egg moves through the membrane into the corn syrup in order to equalize the water concentration levels on both sides.
Fun Ideas To Extend this Rubber Egg Activity
The fun part about creating science at home is that you can easily try out other hypotheses and ideas. Use this STEM activity as a way to get the kids to think outside the box. Talk to them about what they think is going to happen if other liquids are used and have them write out their thoughts.
Even if you don’t actually do the activity, this will show them the process of how a scientist’s mind works!
I hope you enjoyed this fun science activity. Simple science experiments are a great way to encourage curiosity in children by asking them questions, asking them to make a hypothesis on what will happen and will encourage further exploration.
Brenda MacArthur is a STEM curriculum writer, STEM author, and STEM accessibility advocate. She founded the site STEAMsational.com in 2012 which offers hands-on STEM activities for kids and STEM lesson plans for teachers.
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The egg in vinegar experiment dissolves a raw egg’s shell, leaving a bouncy or “rubber” egg. The egg in vinegar experiment is a fun way of learning about egg structure, chemical reactions, osmosis, and the scientific method. It’s a safe and non-toxic project, so it’s perfect for young investigators.
The Egg and Vinegar Experiment, also known as the “Naked Egg Experiment,” demonstrates osmosis. Placing an egg in vinegar triggers a reaction between the eggshell’s calcium carbonate and the vinegar’s acetic acid, producing carbon dioxide bubbles.
The egg in vinegar experiment, also known as a “naked egg” or “bouncy egg”, is the perfect simple STEM activity. Kids and adults alike will enjoy squeezing and bouncing the naked egg. It’s so cool to see an egg staying together without its shell!
Egg Experiment with Vinegar with Two Surprise Ingredients. The results are fascinating & can be recorded in the free lesson PDF for K-8. Take this STEM activity even further in your homeschool or class
This easy egg in vinegar science experiment includes an easy to follow video tutorial, printable instructions and info on how it works.
Make a naked egg with this simple egg and vinegar experiment. This is such a classic science experiment and a super fun STEM activity for kids to study acid-base reactions and osmosis.
Find out why this rubber egg or bouncy egg experiment is a classic must-try science activity you can set up in minutes in the classroom or at home! How can you make an egg bounce? What happens to the shell? Does light pass through it? All science experiments should be exciting, easy, and fun!
Easy Egg in Vinegar Experiment. Follow along with these directions to learn how to make a rubber egg! All the details on how to complete the naked egg experiment from start to finish are listed below, including supplies too. Here is what you need to complete this science experiment: Regular eggs (raw white eggs) White Vinegar. Water.
What happens if you leave an egg in a glass of vinegar? Let’s find out with this easy science experiment for kids. Learn about simple chemical reactions and have fun with the results!
Egg In Vinegar Experiment. Have you ever seen a naked egg? Can an egg bounce? Learn how to make a naked and bouncy egg with this cool egg in vinegar experiment. Things You Need To Make A. 3 Raw eggs. Vinegar. Red, blue and green food coloring . 3 mason jars or any clear, glass jar. Steps To Make A Naked Egg.