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Anything that comes in contact with the solution before you crash it out will have perciptate when it dries. Odd for it to be white with tren but that picture isn't very clear. I always triple risne containers use to transfer the solution with the same solvent into the final container so I don't loose product.
 
The next time you see any black residue, could you see if you are able to move it using a magnet/magnetic stirrer?
So the dark spot in my test e stuck to the magnetic stirrer. Clearly metal contamination
 

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