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LITMUS (apparently a corruption of la...

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Originally appearing in Volume V16, Page 791 of the 1911 Encyclopedia Britannica.
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LITMUS (apparently a corruption of lacmus, Dutch lacmoes, See also:lac, lac, and moes, pulp, due to association with " lit," an obsolete word for dye, See also:colour; the Ger. See also:equivalent is Lac/emus, Fr tournesol)  , a colouring See also:matter which occurs in See also:commerce in the See also:form of small See also:blue tablets, which, however, consist mostly, not of the pigment proper, but of See also:calcium carbonate and sulphate and other matter devoid of tinctorial value . See also:Litmus is extensively employed by chemists as an See also:indicator for the detection of See also:free acids and free alkalis . An aqueous infusion of litmus, when exactly neutralized by an See also:acid, exhibits a See also:violet See also:colour, which by the least trace of free acid is changed to red, while free See also:alkali turns it to blue . The reagent is generally used in the form of test See also:paper—bibulous paper dyed red, See also:purple or blue by the respective See also:kind of infusion . Litmus is manufactured in See also:Holland from the same kinds of See also:lichens (See also:species of Roccella and Lecanora) as are used for the preparation of See also:archil (q.v.) .

End of Article: LITMUS (apparently a corruption of lacmus, Dutch lacmoes, lac, lac, and moes, pulp, due to association with " lit," an obsolete word for dye, colour; the Ger. equivalent is Lac/emus, Fr tournesol)
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