Packaging and storage—
Preserve in tight containers.
Purity—
The addition of 0.5 mL of phosphoric acid to 20 mL of a solution (1 in 20) produces no precipitate.
Microbial limits 
61
—
It meets the requirements of the tests for absence of
Salmonella species and
Escherichia coli.
Ash—
It swells when incinerated, and forms a coke-like charcoal that burns off only after prolonged heating at a high temperature. It yields not more than 8.0% of ash.
