This section is from the book "A Text Book Of Materia Medica, Being An Account Of The More Important Crude Drugs Of Vegetable And Animal Origin", by Henry G. Greenish. Also available from Amazon: A Text Book of Materia Medica : Being an Account of the More Important Crude Drugs of Vegetable and Animal Origin.
Pale to golden-yellow; specific gravity 0.924 to 0.927; iodine value about 133 to 143 (or 157 for oil extracted by petroleum spirit); dries to a hard varnish. Consists of the glycerides of linolenic, linolic, oleic and palmitic acids. Used by artists.