chemical precursors

This is very frustrating, Most Chinese suppliers sell such cathinone precursor powder in brown color, and other users tell me that it is white crystalline powder, because according to them the brown color is due to impurities, some real expert who knows can Answer my question? I don't know who...

I think it's PMK's ethyl glycitate but I'm not sure, I'm waiting for answers from experts, thanks everyone!!

I see that to make a chemical precursor requires a lot of chemical reagents, so I wonder if it's worth it

I would like to know what was your experience buying chemical precursors from Chinese suppliers through alibaba, since these are products that violate alibaba standards, the purchase would not be protected by the alibaba escrow system, so it could not be obtain a refund of the payment, by being...