Residual Solvent Testing

Residual solvent testing measures trace chemical compounds that may remain in cannabis after extraction or processing methods like butane, propane, or ethanol hash production. These solvents are used to strip cannabinoids and terpenes from plant material but must be purged to safe levels before product reaches consumers. Testing protocols are standardized across regulatory frameworks to detect compounds including butane, pentane, hexane, and heptane at parts-per-million (ppm) thresholds. This is a quality and safety metric rather than an aroma descriptor, though residual solvents can alter the sensory profile of concentrates if present above detection limits. Breeders and processors rely on these tests to validate extraction safety and product compliance.

While not a breeding trait itself, understanding residual solvent profiles informs extraction-focused breeding programs. Breeders selecting for high resin or terpene density may work with processors to optimize cultivar suitability for solvent-based extraction methods.