// Definition
A quantitative method for assessing hash purity by weighing a sample before and after completely melting or vaporising it. The percentage of weight lost corresponds to the proportion of active resin versus inert plant contaminant remaining behind. A true full-melt hash would lose nearly all its weight, leaving minimal residue.
// From the Episode
Discussed as a simple at-home method that any hash maker can use to objectively assess quality without lab equipment. The process involves weighing a known quantity of hash, melting it completely on a heated surface, then weighing the residual ash or contaminant. Mark Scialdone noted that this type of straightforward gravimetric measurement has been used in chemistry for centuries and provides reliable quantitative data. The group discussed how it complements visual melt tests and gives a numerical purity percentage.