Blood Drug Testing

The Marquis test (drug testing kit) turns black when tested positive on mda.could alt chem also make go black?

Public Comments

1. If you are asking "could other compounds also turn Marquis black?" the answer is yes. Marquis reagent is primarily concentrated sulfuric acid. As such, it will char many organic materials. Additionally, it will also form black chromophores (turn black) with several drug compounds.
2. http://www.erowid.org/chemicals/mdma/mdma_faq_testing_kits.shtml