Okay, I went to TSC and bought a 20# bag of Red Lake Earth DE. I wanted it to sprinkle in the coop and run for help keeping bugs at bay and for the smell. I have never messed with DE before and knew nothing about it before seeing it mentioned here. Question is: Is it supposed to be a white powder? The bag I got is a dark gray powder. Is this right? It says food grade on the bag and even gives measurments as far as how much to add to feed for different species of animals. It just threw me because all the pics I see on here of it is white.