Mephedrone is the 2nd bath salt configuration of this synthetic stimulant found on the street. Not as common as the MDPV, we recommend conducting this test only after you have conducted the MDPV Reagent and not received a positive. This presumptive field test will positively identify Mephedrone with an IMMEDIATE Purple color after breakage and agitation of the 3rd ampoule. This product will again be sold as standard household substances like bath salts, stain remover, plant food or glass cleaner. 10 tests/box.