"Best" Play Dough - cooking recipe

Ingredients

2 1/2 c. flour
1/2 c. salt
1 Tbsp. powdered alum
2 c. boiling water
up to 3 Tbsp. cooking oil
food coloring

Preparation

Mix dry ingredients together.
Add boiling water and oil. Stir.
Knead and add food coloring as desired.
Store in airtight container.
Keeps for months.