Equal parts cornstarch and water. Stir, stir, stir. And then add food coloring.
But I was lazy.
I didn't want to get a stool and climb up to get my bright Wilton food coloring gel. So I just used the plain ol' stuff.
Bad idea. The colors just weren't bright enough. Everything was drying white.
Lesson learned. Next time, just use the good stuff the first time. I ended up climbing on my step stool anyway and adding good color in the middle of the driveway.
Cheap and easy summer fun.
Even movie stars enjoy it...