How to test fentanyl: if you intend to use an opioid, first you need to check it using a test kit to rule out presence of dangerous adulterants such as fentanyl. Fentanyl can be even 100 times more potent than morphine, and therefore is easy to accidentaly overdose on. Fentanyl can be mixed in any kind of sample and can’t be identified by appearance. To detect fentanyl or analogs it’s recommended to use fentanyl test strips.
How to test heroin & opioids: if you intend to use heroin or other opioids, first you need a heroin test kit to check it for adulterants. Pure heroin can look brown, black or white, and can’t be identified by appearence. To test heroin use reagent tests Marquis, Mecke and Froehde in single-use or multiple-use test kits. To detect fentanyl or test for fentanyl analogs it’s recommended to use fentanyl test strips.