Homemade (Nontoxic) Colored Powder

1 cup corn starch
⅓-½ cup water
1 ounce container icing color I used Wilton icing colors, but any food dye can work well.

In the mixing bowl, stir together the corn starch and water. You want a consistency that feels like a thick paste but will ooze off your mixing spoon given enough time. Now is a good time to put those gloves on.
Next, mix in the food dye. I used the entire 1 ounce bottle to get the vibrant colors you see (red and blue).
Allow the mixture to dry out. I placed my mixing bowls high up on a shelf in our kitchen and left them there for two days. You’ll know the mixture has dried out when you see cracks in the surface.
Place the cracking powder on a baking sheet. I heated up my oven to 350°F. Once it had completely preheated, I turned it off, placed the baking sheet with the powder inside, and left the oven door open just a crack.
This dried the powder out even more, as it allowed moisture to escape out the (barely) open oven door.
I allowed the powder to dry out in this way for 30 minutes. If you have pressed the powder into a thin, even layer before baking, you’ll begin to see cracks in the surface again, indicating that it has dried out.
Pulse the dried-out powder in the blender or food processor until all the clumps are gone and you have a super fine and lightweight powder.
Store in a ziplock bag until you are ready to use it.