wash in minus celcius temp acetone
i believe you did somem isatkes when crystalizing, like you crystalized that including impurities. if liquid with mmc was dark colors you should removethem before all of the luqid crystalized - I believe.
remember to make them almost solid to make good purufication, if you dont do that you will waste a lot of acetone,1-3 rinses will dp its job but if you wont push them into surface it will take a lot
I make a solution of water / IPA (70/30), warning it up and add 4mmc powder, in proportion ( 1g 4mmc / 2,5ml water/ipa )
After complete dissolution I pour it into a container for evaporation and put it in dark place.
@MMX right now I'm in evaporation process of 60g of meph powder in 30:70 water: alcohol solution, If i heat it will it crystalize faster? How much heat should i use ? And how to heat it? Like direct heat for hot plate or hot water bath? What is difference between organic evaporation, and heating it?
yes it was beacsue the impurities were in less volume, cuz of cryatlls appeareed. but your mistake was that you let evaporate solution with impurities that made one solid mass with previously purified crystals.