Here are several pictures of the Cocaine Purity EZ Test results from cocaine purchased from Juandedios on Abraxas in November. He advertises it as being 90% pure and I have no reason to disagree. Great product, great price. He can be found on Alphabay or around here at vendor_juandedios.
I put very little faith in these tests. The important part about coke is what is it cut with. It's the active cuts that will ruin it for you.