If it smells of paint, could it possibly be amphetamine sulphate? Is it a bit like plaster/dry wall in texture and white in colour? Or is it like good quality waxy coke?
tacodude are you referring to the test where you drop it in bleach to see of it turns orange? I may be mistaken but I'm pretty that test was used in the 70s to test for a popular cut back then.
Regardless, injecting anything that reaks like petroleum directly into your veins isn't recommended for your health. If you're going to do it at least take it easy with smaller doses at first.
Godspeed.