"Analysis by color tests (Marquis and nitroprusside), GC/MS, and UV, however, indicated not MDMA but rather a 1: 1 mixture of benzylpiperazine (BZP) and trifluoromethylphenylpiperazine (TFMPP) for the orange, green, purple and blue tablets, and a 1: 2 mixture of BZP and TFMPP for the pink tablets."