Chalkboard Halloween Slime Science

It’s October, so a Halloween themed activity is only suitable! I have been a huge fan of slime and oobleck for most of my life, so when I saw chalkboard slime I knew I had to try it. Chalkboard slime is just like normal slime but it’s solid black and you can draw on it! I drew spider webs, a ghost, and made different patterns onto the slime. When you fold and play with the slime your design disappears and you can draw on it again, it’s basically a squishy chalkboard. The chalk markers work best when you draw little dots, but as the slime hardens you may be able to draw lines as well.

Spider web slime!

You need:
4oz Elmer’s glue
Chalkboard paint
Baking soda
Saline solution
Chalk markers

Step 1: Pour 1 entire bottle of Elmer’s glue into a bowl.

Step 2: Add 2 Tablespoons of chalkboard paint into the glue and mix.

Step 3: Mix 1 Teaspoon baking soda into the mixture.

Step 4: Add in about a spoonful of saline solution, mix continually, then add more if needed. The slime tends to harden with time, so it’s okay if it’s still a bit sticky.

Step 5: Grab some chalkboard markers and start drawing. Fold the slime and the chalk marks disappear!


Slime is formed from two molecules,  polyvinyl alcohol (found in school glue) and borate (found in borax, saline solution, etc). When the two molecules combine, a chemical reaction occurs, creating long chains, and tons of those chains form to create slime.


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