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it's impossible to tell what impurities are in a "powder" obtained off the street. Especially when discussing such a thing on the internet. A million things can taste "metallic" including things that do not even have metal in them such as psychedelic phenethylamines.
well in the absolutely worst case it could be mercury left over from an Al/Hg reductive amination. Usually that is well-filtered out but one never knows, crappy alchemists can leave all kinds of things behind. Even if insoluble Hg2Cl2 is used in the process, a little bit of the very neurotoxic HgCl2 can form from the reaction between elemental mercury formed in-solution and the Hg2Cl2. This, if not reduced to elemental mercury could potentially be left behind in the powder after a filtration.
If one wishes to attempt to purify the MDMA powder from any mercury salts (as well as several other metals that could be an impurity), swiY can dissolve the powder in a minimal amount of water, filter it and collect the water that drips through. Evaporate/lightly boil away the water to yield the MDMA powder again - any metal or soluble metal salts contained should be left as a residue on the filter paper.
An important exception is if the chemist used mercuric chloride (mercury (II) chloride). If this is the case, the best ways swiM's turtle can think to remove it is to either find something that it is soluble in that the mdma powder isn't, the vice-versa of that, or to essentially repeat the reductive amination process herself (without adding more mercury that is), by adding small pieces of aluminum that had been pre-soaked in water to a solution of the suspect mdma powder, bringing to a light heat for a while and filtering out the metal. If any HgCl2 was contained within, it should be reduced to the insoluble mercury (Hg) which would be easily filtered out with the aluminum.
^ That is why swiM's turtle doesn't approve of the Al/Hg reductive amination method. Mercury shouldn't be used to produce things people consume, unless by a competent chemist who knows precisely what they're doing. There are safer routes to reduce Md-p2p such as the leuckart reaction, which uses ammonium formate or methylamine formate to yield MDA or MDMA.
However, it could be another metal used in the preparation process as well. Or even not be a metal, just swiY's mind playing tricks on her. Don't think there are any stories of people being poisoned by impurities in 'commercial' mdma powder, so in the end swiY will probably be alright but if she is paranoid or if she really thinks that there could be a risk, perhaps the above might help. As RaverHippie mentioned, it's quite impossible to tell what is in the powder - any number of metals or other compounds could have been used in the manufacture process at any given point, and thus there is no one way to know what is contained without actually asking the alchemist him/herself.