Litmus
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
CAS RN®: 1393-92-6.-A blue pigment prepared from various species of Rocella DeCandolle, Lecanora Acharius, or other lichens (Fam. Parmeliaceae).
Description: Cubes, masses, fragments, or granules, of an indigo blue or deep violet color. Has the combined odor of indigo and violets, and tinges the saliva a deep blue. The indicator substances it contains are soluble in water and less soluble or insoluble in alcohol.
Ash: It yields not more than 60.0% of ash.
