if you have brown meth, whoever the chemist is is a fucking retard, meth isnt hard to synthesize, i would doubt it being meth, especially since apparently 50% of the meth in the US comes from mexico now, and the shit isnt called CRYSTAL meth for no reason, meth is too hard to cut compared to coke, and it doesnt change hands nearly as much as coke/smack, and its a hell of a lot easier to produce, and i wouldnt doubt the mexicans smuggle it over pure/uncut, apparently they have superlabs that synth kilos at a time.. Probably MDMA, if its anything active man. Hmm. Problem is, heating it in a bag, would condense in the bag methinks, and potential for mold/mildew. Id leave it out for a day or so in the sun, heat will degrade it, but not room temperature/low temps. What you could probably do is dissolve it in water, then boil off that water, or acetone wash it, that would maybe remove some of the cut too.