How to Melt Crayons (and Make New Ones)

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Learn how to melt crayons by baking them in the oven and make your own beautiful new crayons that you can use as DIY gifts for friends and family.

Melting Crayon Shapes and Colors

Ever since the melted crayon rocks activity, my kids have been itching to melt more crayons.

Since we don’t use our crayons anymore, I don’t see why not let the kids have fun and melt some old crayons down to make new, unique, beautiful ones.

The main reason why the kids no longer use crayons is that most of them are broken. What to do with old crayons? I have contemplated tossing them out multiple times, but if you love crafts and science experiments, you know that they will of use one day.

And today is the day! I love that we are recycling old crayons and giving life to them. The colorful new crayons you create can be used for party favors, Valentine’s Day gifts, or even fun alternatives to candy on Halloween!

How to Make Your Own Crayons

Materials:

Instructions:

  1. Preheat the oven to 275 degrees F. 
  2. Remove the paper wrappers from each crayon.
    1. If you have an X-ACTO knife, running the blade down the length of the wrapper will make peeling the wrapper off nice and easy.
      Melting Crayon X-ACTO Knife
    2. If you do not have an X-ACTO knife, put your broken crayons in some water. The water will loosen the paper wrappers and make them easier to remove.
  3. Cut your crayons into little pieces. You can break the crayons by hand, or use knives to cut the crayons. 
    Melting Crayon Broken Crayons
  4. Fill the silicone molds with crayons. Since there are holes between the crayon pieces (unless you cut them very fine), the crayons will melt down and take up less space. Therefore, I recommend slightly overfilling each mold so you get a thick piece of crayon.
    Melting Crayon July 4th Stars Mold
  5. Place the molds on a cookie sheet and bake them in the oven for 5-8 minutes or until the crayons are completely melted.
  6. Carefully remove the mold from the oven and let it cool completely.
    Melting Crayon Star Mold
  7. Take out your new crayons from the silicone molds.
    Melting Crayon July 4th Stars Mold

My kids had so much fun cutting the crayons. We have these awesome Curious Chef knives for kids at home that my kids use often to cut their own fruits or help with prep work. 

Melting Crayon July 4th Stars Mold

I do recommend using silicone molds versus metal ones because they are so much easier to pop out. Some of the crayons seem pretty set in the molds and I can’t imagine having to take them out of a rigid mold.

I also recommend not omitting the cookie sheet. The silicone molds are flexible and it’ll be very difficult to hold a burning hot silicone mold full of melted hot wax flat as you remove the mold from the oven. Trust me, you do not want to risk getting melted crayon on yourself, the oven, or the floor.

Melted Crayon Stars

The Science Behind Melting Crayons

I bet you think melting crayons is more of an art lesson than a science lesson. But there is a key concept here we need to explore, and that is reversible changes.

A change that can occur backward, or can be reversed, is called a reversible change. 

If you keep water in the freezer for a few hours, it turns into ice. However, once you take it out and let it sit at room temperature, the ice will melt back into water. No chemical change has happened.

Similarly, the old crayons were melted, but when they cool down, they were still crayons. The only thing that changed was the shape and colors of the crayons!

The crayons did not undergo a chemical change when they were melted. When a change which cannot happen backward, or reversed, then it’s an irreversible change. 

For example, when you make plastic with milk and vinegar, you can’t reverse the process and make milk from plastic. Another example is when you erupt an apple volcano by pouring vinegar into baking soda, you can’t go backward and make baking soda and vinegar from the foamy lava.

If you watch the crayons melt in the oven carefully, you might notice that some colors melt faster than others. You have to compare two pieces with similar size and shape, but if you manage to find two with different colors, observe how fast each melt in the oven.

Crayons contain pigments, which give each crayon its color. You might notice that black crayons melt the fastest because it absorbs the heat quicker. This is the same reason why wearing black clothing on a sunny day makes you hotter when you stand outside than wearing light-colored clothing.

You can also experiment with different brands and see how the crayons hold up to heat. Find two crayons that have the same color but different brands. Place them in separate molds and see which one melts faster.

Melted Crayon Seashells

Final Thoughts on Melting Crayons

Recycling crayons by melting old, broken crayons in the oven and creating new, beautiful ones are so much fun. My kids spent more than an hour cutting and shaving down the crayons and they just love the new ones we made.

Try out different color combinations! Since July 4th is coming up, we made a few red, white, and blue ones to celebrate!

Melting Crayon Star Red White and Blue

If your kids liked this activity, be sure to check out the melted crayon rocks!

Then for Halloween, you can melt crayons on a pumpkin with a hair dryer. Check out how here.

Melted Crayons in the Oven Pin

4 thoughts on “How to Melt Crayons (and Make New Ones)”

  1. Hello. I have a quick question. My crayons while melting in the mounds has the oil sinking to the bottom. It separates in the silicon mold. Please help.

    Thanks

    1. What kind of crayons are you using? I first tried with dollar store crayons and they were separating as well. Then I used Crayola ones and they worked.

  2. Hello, I decided to make letters out of crayons to give my children’s classmates a personalized gift for Christmas. Making every child’s name for both of my children’s classes (16 kids in one and 23 in the other) has been overwhelming, but it’s like, I can’t stop now or it will be such a big waste especially after ordering jewelry boxes for approx 1$ a box ( best price I found ) and I know I’m in over 1,000 Crayola crayons already and still have a long way to go. They are now a valentines Day gift instead of Christmas. The biggest issue is my daughter’s class of 23 kids needs 25 letter A’s . With names like Aalayah , Giavanna, and Arabella it’s so many A’s when your getting one at a time, I’m pretty much just making vowels at this point. Anyway, my question is some letters are very difficult to remove without breaking and were talking letters an inch thick. I’ve cried after the 5th time of trying to remove the same letter U and it breaking ,I had to remelt it and cool it again just to have it happen again. Is there a trick to remove the G and U ? Also just wanted to mention the wax separation (wish I could post a pic) even with Crayola , there is a good 1/8 ” of clear wax that floats to the surface, good thing that is the back of the letter. Thank you for taking the time to read this long comment.

    1. When you melt the crayons, do you first break them up into little pieces or shave the crayons into the molds? You can also try lowering the oven temperature to prevent the separation, though that will take some trial and error. If you are using solid colors, you can also stir the wax and pigment together before letting everything cool off.
      As for the breaking, I used silicon molds and everything came out pretty easily. I would take a small wedge and go around the entire perimeter and get all the sides off before trying to take the letters out.
      I am sorry this is causing you so much pain! Hopefully the above will help. If not please reach back out!

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