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Based on a test result that was sent to Drugs Data from a Boston-based submitter that was said to have sourced the sample from New York, there's a possibility that Xylazine could be found in future samples of Ketamine: https://drugsdata.org/view.php?id=17491
Submitter notes that (prior to sending): 'Used Bunk Police reagents and every 'ketamine' reagent reacted incorrectly. LSD, DMT, shrooms, and mescaline all reacted.' -- I don't use the Bunk Police reagents, and therefor I am not entirely sure what they consider standard "Ketamine" reagents. I assume they're any of the ones that would react to Ketamine such as Mandelin, Morris, and Liebermann, but without photographic evidence, we have no idea what the test results looked like on the submitter's end compared to the DD results, which only use 3 reagents at a time, and has shifted over the last couple of years from Marquis, Mecke, and Mandelin to Marquis, Froedhe, and Liebermann.
Liebermann should react very light yellow to the presence of Ketamine--which is unclear from the DD photo, but they did note there was a "slight change", and the Marquis didn't seem to react at all. However, after digging around and finding some newer samples tested by DD that were Xylazine only, it would appear Xylazine also may give a pretty obvious pinkish color reaction on Marquis, which is not something I had seen previously looking around on DD. I've linked all referenced tests below, however, based on the lack of reaction on Marquis in the DD test of the contaminated sample and the 2016 Xylazine test result, it's possible that Xylazine doesn't always react on Marquis (weird), but consistently reacts to Mecke, as discussed in the video.
It seems as if they had tested this particular batch before ingesting, it would've been clear something was up with this to begin with. I have NO idea why the Ehrlich reagent (which is used to detect LSD/DMT/Shrooms) reacted, as none of these substances have an indole ring(?).
However, I'm sharing a couple of extra tips that could be added to the testing process at home to help potentially detect Xylazine in Ketamine. The Xylazine test strips don't seem to be available for general consumer use, and drug checking technicians have found a lot of issues using them for testing various substances. It is reported that they (the BTNX brand) XTS are more likely to give false negatives than false positives, but this is when testing for minute amounts present in opioids. If you have something that was sold as Ketamine that is actually all, mostly or even 20% Xylazine, I am willing to bet the strips will pick that up. It is NOT advised to test stimulants like cocaine with the XTS, because there are known false positives for common adulterants like lidocaine.
Use these DD test results for reference:
Submitted sample:
https://drugsdata.org/view.php?id=17491
Xylazine on reagents (2022):
https://drugsdata.org/view.php?id=12571 https://drugsdata.org/view.php?id=12520
Xylazine on reagents (2016):
https://drugsdata.org/view.php?id=4877
DanceSafe Reagent Instructions/Reaction Chart:
https://dancesafe.org/testing-kit-ins...
Experience Notes 'This sample caused symptoms of anticholinergic toxicity (dry mouth that caused me to speak with lisp, dry eyes that felt like a facelift, and muscle spasms/myoclonic jerks)...'
I have access to XTS (WHPM/DanceSafe brand) and I do test Ketamine samples for Xylazine now.