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Orcein :: Orcein (n.) A reddish brown amorphous dyestuff, /, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus..

Turnsole :: Turnsole (a.) Litmus.

Test :: Test (v. t.) To examine or try, as by the use of some reagent; as, to test a solution by litmus paper..

Lacmus :: Lacmus (n.) See Litmus.

Neutral :: Neutral (a.) Having neither acid nor basic properties; unable to turn red litmus blue or blue litmus red; -- said of certain salts or other compounds. Contrasted with acid, and alkaline..

Alkali :: Alkali (n.) One of a class of caustic bases, such as soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue..

Litmus :: Litmus (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..

Parelle :: Parelle (n.) A kind of lichen (Lecanora parella) once used in dyeing and in the preparation of litmus.

Amphichroic :: Amphichroic (a.) Exhibiting or producing two colors, as substances which in the color test may change red litmus to blue and blue litmus to red..

Erythrolein :: Erythrolein (n.) A red substance obtained from litmus.

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