The amount of different colours you want to use in your slime is up to you. You can use one colour or all 8 colours to make rainbow slime. Before making the slime, you will need to grate the crayons that you will using in your slime and then put them aside until needed.
Next, empty the glue bottle into a large bowl. Fill the empty glue bottle about ⅓ full with warm water - this works out to about ¼ cup of water. Seal the lid on the glue and shake the bottle well to combine the remaining glue in the bottle with the warm water. Pour this water and glue mixture into the bowl with the glue and stir to combine.
Add the baking soda to the glue and stir to mix thoroughly.
Add the grated crayons to the mix and stir in well.
Lastly, add the contact lens solution slowly while stirring. Add just enough of this contact lens solution to bring the glue together into a soft ball. Just remember, regular glue will require less contact lens solution than glitter glue.
Remove the slime from the bowl. It will be sticky, but as you knead it like bread, it will come together. If it is still sticky after kneading for a while, you may need to add a drop or two more of the contact lens solution. When it is no longer sticky, the slime is ready to play with.
This slime is best stored in an airtight container in the fridge.