Question: how to make slime harder without borax?
Answer: Put 1/2 cup shampoo and 1/4 cup of cornstarch in a bowl.
Mix well.
Add 3 drops of food coloring (optional).
Add 1 tablespoon of water and stir. Slowly add 5 more tablespoons of water, stirring well after each one.
Knead the slime for around 5 minutes.