Hummel, J. J. (John James), -1902 · London : Cassell & Company · leaf 148
132 DYEING OF TEXTILE FABRICS. [Chap. IX. the latter is carefully applied. Excess of lime in the corrected water is readily detected by adding a little of it to a filtered decoction of cochineal. Such excess changes the yellowish-red colour of the solution to a violet. Other delicate… … with Caustic Soda. Fjg. 40. — Plan of Porter-Clark’s Apparatus for Softening Water. — For purposes of scouring, or where a slightly alkaline water is not prejudicial, caustic soda may be conveniently substituted for quicklime, since its solution can so readily be made of a standard strength and…
Dyes and dyeing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
