What are the identifiers of heroin?

Heroin is an illegal opioid often encountered in various physical forms, with its color and appearance being significant identifiers. The correct identification highlights that heroin can appear as a powder that ranges in color from white to dark brown, as well as variations such as black tar heroin. This range in coloration is due to different processing methods and the presence of impurities.

The other options do not accurately describe heroin. It may not always be blue; this is not a characteristic associated with heroin. While some substances may have a fruity odor, that is not a hallmark of heroin, which is typically odorless or has a chemical smell. Furthermore, while heroin can exist in various forms, it is not typically a liquid solution; instead, it is most commonly found as a powder or in the form of tar. Thus, the identification based on color and physical form provides reliable cues in recognizing heroin in various contexts.