And you're saying that we can infer from this that 84% of the time the purple/black result will NOT be masking anything else. This is simply untrue. IMO the purple/black result means next to nothing!
A pill can contain as little as 2% MDMA and still show a purple/black reaction to Marquis. GCMS testing has shown that a pill can contain caffeine and Ketamine for example, as the dominating substances, but will still test purple/black if it has a very small percentage of MDMA. Have you never had a pill of your own that tested positive for MDXX and the taste test proved it had very little E-like substance in it?
QUANTITATITVE TESTING: Tells you how much of each substance is in your test sample. We can't currently access this kind of information. GC/MS testing.
QUALITATIVE TESTING: Tells you a "yes or no" answer. We can access this information with reagent testing.
If your pill DOESN'T test purple/black then it DOESN'T CONTAIN MDMA. Simple equation there, allows you to avoid pills which don't contain MDMA.
If your pill DOES test purple/black then it is likely to contain one or more MDxx-like chemicals.
These are the only two conclusion we are allowed to draw from reagent testing of a single pill. There is no further information that can be inferred from a single pill test. However, by taking a large number of pill tests and summarising the data, a limited number of conclusions may be drawn.
It has been seen in reagent-testing schemes that samples testing positive for MDxx-like chemicals, in the majority, contain only MDxx-like chemicals.
1. Looking worldwide at results for pills that have been confirmed to test purple/black using Marquis reagent, the ratio of MDxx-only pills to MDxx-in-combination pills, is (thankfully) extremely lopsided in favour of MDxx-only. THIS DOES NOT MEAN THAT ALL MDXX-ONLY PILLS ARE GOOD. A pill could contain 1mg of MDMA, test purple/black, and still give a positive result as a MDxx-only pill.
2. Looking at the results for pills that DO NOT test purple/black, none contain MDxx-like chemicals. THIS MEANS THAT IF IT DOESN'T TEST PURPLE/BLACK IT CONTAINS NO MDMA. Globally, there are myriad combinations of random adulterants that have been identified in non-purple/black testing pills. These seem to be the typical "mixture" of stimulants usually, attempting to trick people into thinking they have MDMA.
Quite simply, you cannot ask the tester for more information, as it can't give you more. It can only give you a yes or no confirmation on the presence of ANY MDxx-like chemical, not a ratio, not a proportion, and not a dose range.
However, this is EXTREMELY useful, as even though it will not tell you which pill is the best, it WILL tell you which ones to avoid.
A pill tester is specfically designed to help you avoid taking dangerous pills, not to assist you to find good ones. The statistics merely show that the likelihood of eating a dangerous pill can be
significantly reduced when using a tester. This means the testers are a success for their intended purpose, when used appropriately.
BigTrancer