http://www.shroomery.org/forums/show...Number/7173006
"pure or nearly pure cocaine is yellow, and is made up of what looks like little flakes or scales that are like little panes that reflect light. if your getting white powder, its probably not very pure at all.
if you actually need to chop up your lines for a few minutes just to get it broken up, and it meets the above criteria, its probably rather pure. "