For me, the good stuff tastes sweet when you vape it (and dont burn it). Another way to tell is to take a small piece that looks sketchy and put it in sodium hypochlorite (bleach). If its meth, it will react (fizz and zip around). There are smarter dealers that know this trick though, and know other substances to cut it with that will react in a similar fashion. To tell how badly it’s cut, I usually just watch the puddle harden. If there are different parts that cool down a lot faster than others, and have different crackback patterns, you can tell your shit is cut. The best way to deal with this, is to do an acetone wash on your shit to remove the cut, and then bring it back to your dealer and tell him you did an acetone wash on it, and you want the difference in weight. He /she won’t sell you bunk after that.
As far as clarity, big shards, small shards are concerned, they mean absolutely nothing. You can make cut garbage look like crystal clear big shards… some of the purest crystal is almost powdered
