PARAMETERS

USP 25 p.212

STANDARD

SAMPLE

REMARKS

Description

Blocks or lumps of varying size made-up of tears, compacted together, with a reddish brown, reddish gray, or grayish brown resinous mass.?The tears are externally yellowish or rusty brown, milky white on fresh fracture; hard and brittle at ordinary temp. but softened by heat and becoming gritty on chewing

Identification A

A solution in alcohol becomes milky upon the addition of water, and the mixture is acid to litmus paper

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Heat a few fragments in a test tube: Evolves a sublimate consisting of plates and small, rod-like crystals of cinnamic acid and its esters that strongly polarized light

Cannot be tested presently.

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Heat about 500mg in a test tube with 10ml potassium permanganate TS: develops a faint odor of benzaldehyde