Category Criteria
Coarse
  • Apparently large and visually well-defined bodies of substance
  • A small amount or less than half of the sample is in the form of a fine powder
Coarse and Fine
  • Both visually defined bodies of substance and fine powder are present in approximately equal portions
Fine
  • Powdery appearance
  • A small amount or less than half of the sample is in the form of a coarse substance
Table 1: Texture categories for the description of heroin substance.