Erythrolitmin (also called erythrolein) is the active ingredient extracted from the Litmus lichen, used in chemistry as a pH indicator. The erythrolitmin molecule is related to the orceins, and consists essentially of several phenoxazone and orcinol residues. ==Interaction with acids== The intense coloring of the molecule is generated by the absor...
• (n.) Erythrolein.
E·ryth`ro·lit'min noun [ Greek