Froehde Results Question

[Magenta Toad]

I have something purported to be MDMA. I have tested it with 3 reagent tests, Marquis, Folin, and Froehde. Marquis turns black right away (no purple that I can tell). The Folin test shows the slightly darker orange that is basically expected, but is difficult to really tell comparing to some other possible substances. Froehde quickly leads to a dark blue (traditional royal blue...https://en.wikipedia.org/wiki/Royal_blue). I have used Froehde on other samples and have gotten the expected dark green to black reaction. The dark blue color is unexpected. The color charts say 5-APB and 6-APB can be lighter purple colors and I have watched the BunkPolice video for 5-APB and the video shows a different color (think concord grape juice purple) than my sample. Anyone have any ideas what is going on with the Froehde test? Is that blue color alright?

 

[sekio]

It's hard to say, how recently prepared was your reagent?

 

[marlymonster]

The reagent was brand new. I did figure out the issue though...I was using to much material to see the color change from green/yellow to blue properly. I was using very little material before, but even less was appropriate.