All this is very interesting and the photography is great but I'm not sure what the practical value is. Like one of the previous posters said, if you are trying to identify unknown powders by sight you are asking for trouble. There are so many uncatalogued powders out there that look like one thing but act like another. I understand trying to keep costs as low as possible, but what is it worth if it leads to a blown gun or, worst yet, an injury. If you are reloading, your powder should only come from a sealed factory container that you have opened yourself. Anything else is just flirting with disaster.