I have never seen black tren, somebody else told me too that he was concerned about the new tren.
It is just guess work without lab testing. get something like home steroid test to see what inside is. you will see if it its tren or they just messed up with some black paint die.
I had some pills testes ( another UG not GP), some powder + glue + paint die inside only.
I had some of their gear lab testes (not all,) came out good but things are changing all the time today good gear next day junk.