I’ve not handled meth, myself, but I know that coke usually clumps up into flakes that have a “fishscale” like appearance to them with the way light reflects off of it. That slightly pearlescent appearance is the first thing a buyer would be looking for, because there’s not a whole lot of other white powdery materials that look like that. It also clumps up with a consistency slightly similar to something like Comet cleaner, so it wouldn’t be as fine-grain as sugar or flour would be.

I dunno why I’m helping you disguise your fake drugs lmao, just be careful.