What causes the tweak to turn black

So I picked up this ish, and when I melted it down, it turned black. I am talking about like motor oil black. I am pretty sure it was cut, but it dodnt taste too bad, and it took a lot to get high...Anyone know what would cause that to happen?
 
Hi. Welcome to BL and to Blogs!

I don't know what might cause that, but to be honest I couldn't read your post very well due to the font/colour choice. Might I suggest looking around Other Drugs? They'd probably know. UTSE before asking, I hear that they're a cranky bunch around there ;)
 
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