ok friend... well, then it is with total certainty that the methylamine has not done the job well and has not succeeded in displacing the bromine, which is what produces that tear effect... The methylamine that you are using is not in the proportion correct so you should add an excess of it..ok?, next batch add 30ml or 35ml of methylamine this will not ruin your work at all, on the contrary, an excess of methylamine generally favors the synthesis of bromoketones made in home laboratories since the controlled environment for the synthesis is not available. try to make another batch and at room temperature give it more time to react well, I cleaned its base well at least 3 times with distilled water, and yes, when you add the cold hcl drop by drop at 1:5 with ice-cold acetone, put your magnetic stirrer at full speed, because when the hcl is added on the base, this must be in constant movement to produce the salt (this can take a little time for the mephedrone crystals to begin to appear), once the pH reaches 5 its glass The precipitate must be full of crystals, let it move for another long time and then put it in the freezer for a few hours. Once this is finished, filter the crystals and dry them well to proceed with their recrystallization in acetone and water.