Litmus

['lɪtməs]

Definition

(noun.) a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator.

Typist: Preston--From WordNet

Definition

(n.) A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.

Checked by Benita

Definition

n. a dye obtained from certain lichens originally red but becoming blue on the addition of alkalies or of lime.—Litmus paper paper used in chemical testing tinged blue by litmus reddened by an acid made blue again by an alkali.

Edited by Candice

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