The Heroin Purity EZ Test Kit is designed to help identify a substance as heroin and give an indication of its purity. Rather than simply showing whether heroin may be present, this kit is intended to help users better understand the likely level of heroin in a sample and the possible presence of adulterants. It is also designed to be insensitive to common cuts such as mannitol, helping reduce interference from substances often found in heroin samples.

The test works by producing a colour change in the bottom layer of the test liquid when a precise amount of sample is added. As the amount of heroin in the sample increases, the lower layer shifts to a yellow/orangey colour that becomes progressively darker. That change is then compared against the included colour chart to give an indication of heroin purity, with the degree of colour change corresponding to the amount of heroin present in the sample.

Because this is a purity test, accurate sample size is especially important, and the kit is designed around a carefully measured quantity for reliable interpretation. The Heroin Purity EZ Test Kit is intended to provide a quick visual indication of heroin purity, and for best results it is recommended alongside the Opiates Drug Testing Kit.