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For Returns, please check the seller link. The Ehrlich reagent is an example of a single-application reagent which is used by consumers.
It can only detect drugs with an indole moiety, but Pierson MI sex dating is useful because drugs from the NBOMe class do not have an indole and are often sold as LSD which does. Froehde reagent Other reagents are discussed in scientific literature but limited applications mean they may not be sold for consumer testing. The research team suggests using gas chromatography-mass spectrometry as the most sensitive and specific testing method for identifying MDMA and its contaminants  but this is out of reach testng users in most countries and reagent tests remain popular, often distributed by harm-reduction organisations due to their low cost and high utility when multiple test reagents are used.
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The zimmermann reagent for benzodiazepines is tdsting good example - its use is limited to benzodiazepines, and when these are mis-sold it is usually by substitution of a different benzodiazepine, rendering the test unuseful for consumers. These agents do not help identify pure MDMA tablets. The Ehrlich reagent has an additional benefit over other reagents in that it does not react with the paper on which LSD is often distributed.