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.
Para copaiba is a thin, clear, bright yellow liquid quite free from any fluorescence. The specific gravity varies from 0.917 to 0.980, but is usually low. In accordance with the greater fluidity of this variety the percentage of volatile oil is high, viz. from about 55 to 90 per cent. In other characters the drug resembles the Maracaibo variety.
Para copaiba also consists essentially of volatile oil and resin.
The resin consists of amorphous resin-acids associated with crystalline paracopaivic acid (2 per cent.), homoparacopaivic acid, and two resenes.
The volatile oil appears to be identical with that of Maracaibo copaiba, but the resins are certainly not.