I recently bought some cocaine from vendor "LeftCoastEnV." Long story short, I ran a test kit on it and marquis reacted orange (either amphetamine, methamphetamine, or mescaline...). I forget the colors, but the other reagents also showed expected results for amphetamine/methamphetamine (I think simon turned purple, so I'm guessing the blue indicates meth, and maybe some other cut reacted red, which resulted in purple.. I am not an expert on test kits or interpreting results).
I didn't take pics to back this up, but I could do this in a few days. I suppose it is possible that something was wrong with the test kit, but it did yield expected results for some MDMA I bought from a trusted vendor and a few other substances.
Now it is good stuff, and I honestly don't care if it's cut with meth/amphetamine, which are both drugs that I like more than cocaine. All my friends who tried it thought it was fantastic, and I do believe there is at least some coke in it. I guess I'd like some money back if the vendor were to respond here and offer it, but I was not surprised to see this result as cocaine is frequently cut in this kind of way. Just thought I should post this here for anyone contemplating buying this stuff. Knowledge is power. I think I will try nosecandyshop on Dream next time.
Anybody that believes the bricks are 90% pure when they leave Colombia/Bolivia or Peru has been misinformed. Many times the producers themselves cut it down to the 70% range already. The blow changes hands about 4-5 times before it reaches you, so no wonder average street coke is only 20-40%. Middlemen mostly use baking soda, sweeteners or food supplements as their cutting materials. The levamisole, amphetamines, lidocaines etc etc are added at the start.