I was writing a reply to a tread that got closed, before I could make the post. Should have copy and paste but didn't, think its useful info so going to re-write swiy answer.. Sorry if it has been covered before.
When MDMA gets made in a lab, then pressed into pills. Any shape, size, color, logo. etc.. can be made. Any kind of stamp can be made by engineers (Logo and shape), Color (food colorings can be used), Size (binders and MDMA, or whatever can be used)
When pills and or MDMA is made Mr A, Might use a new logo, color, etc.. And puts in 100mg MDMA hydro 83% (think 88% is the maximum in a pharmacy lab) So 83% pretty good for a underground lab !
Mr A sells it in large quantity's (500,000 or more at the time)
When it reaches the consumer words will go around, he man those (imprint color) Are ace, they are the best, etc..!!!!!
Now Mr B (the competition) is aware of this and will make the exact same Pill but puts in 50mg of whatever quality MDMA (or whatever..)
When it reaches the cunsumer... they will not know where it comes from. Some people know exactly where it comes from... (swim did 10 years ago, not now !)
All swim wanted to say is, you can never know whats in a pill (there are exceptions) Unless swiy gets them tested.
Think if swiy buys lets say 10/20 pills from the same dealer there is a good chance they come from the same lab, and if one is tested the others should be the same.. but could never be a 100% sure..