I think the idea is that the food coloring in the kool-aid changes the color of the buds. I'm not sure if this is true, but I do believe there was an experiment done with food coloring at some point. Not sure where I read about it, but you could certainly do some searching to find out. The only reason I could see someone wanting to do this is be able to market "exotic" colored weed. IMHO, even if it did work, I wound't bother, it's not like it does anything to improve the bud, and also leaves questions about the effect of burning buds with food coloring in them. Anyway, seems pointless to me.