In a mixing bowl, mix corn starch and water to form a consistency that doesn't ooze off
Wear protective gloves and mix the food color with the cornstarch mix.
Allow the mixture to dry for 2 days in a bowl.
After 2 days place the dried powder in a baking tray in a preheated oven for 30 mins at 350 Degree.
This will dry up the mixture more and cracks will appear in the powder.
Blend this mixture in a blender to form powder
Store in a airtight container.