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See also: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: |
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