duquenois–levine thc test

Solution A: Add 2.5 ml of acetaldehyde and 2.0 g of vanillin to 100 ml of 95% ethanol. Solution B: Concentrated hydrochloric acid. Solution C: Chloroform. Material extraction: A 1 g sample of marijuana was extracted using 15 ml of hexanes (or petroleum ether) and dried to 8 ml for use in the...