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DS: "For all reagents except Ehrlich’s and Morris, the reaction is only valid for the first 40 seconds or so. [For Morris]... The final color will appear after stirring for a full 30 seconds."
I can't find any clarifying info online, hoping to find my answer here. For context, today when using Morris A/B to test alleged MDMA it starts off green for the first minute, but after 2-3 minutes inevitably turns to jolly rancher blue. But all other tests gave me no reason to think product is anything other than pure MDMA.
Wondering if I can ignore that later result because it's past the valid time threshold?
Yes, you would definitely disregard that blue Morris result here. Morris is intended to be read at 30 seconds.
All reagents will eventually react to the oxygen in the air and change colors. You're looking to see whether the reagent will change color in reaction to the tested substance, not the air. This reaction to the substance generally occurs within just a few seconds.
Some reagents like Morris and Robadope are a little slower, and others like Ehrlich and Hofmann are much slower, but generally you should read the reagent's immediate result or up to a minute or so at most.
Just out of curiosity, why are you testing your MDMA with Morris? Did you also test it with other reagents?
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No harm in running negative controls. I just wanted to be sure you knew that it was not a typical test to run on MDMA.
DanceSafe doesn't sell them, but FYI reagents like Robadope and Zimmerman make better negative controls for MDMA, since they react to substances like MDA and cathinones that are more commonly found as adulterants in MDMA.