Library

Reference articles on the compounds behind botanical extracts: identity, forms on the market, how to read an analysis, behaviour in formulation.

Extraction & quality

• Solvent residues

  A solvent residue is extraction liquid left behind in an extract. To take an extract from a plant, the plant is washed with a liquid, the wanted substances pass into that liquid, and the liquid is then driven off. That liquid is called the solvent. With a liquid solvent the driving off is never…

  Last reviewed: 12 October 2026