chrome alum
Americannoun
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Also called ammonium chrome alum;. Also called ammonium chromic sulfate. a green, crystalline, water-soluble powder, chromium ammonium sulfate, CrNH 4 (SO4 ) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.
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a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO4 ) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.
noun
Example Sentences
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On evaporating the solution these substances crystallize out as potassium chrome alum, which substance is produced as a by-product in the industries using potassium dichromate for oxidizing purposes.
From An Elementary Study of Chemistry by McPherson, William
Then write or draw upon it with an ink containing chrome alum, allow it to dry exposed to light, and immerse the plate in water.
From Paper and Printing Recipes A Handy Volume of Practical Recipes, Concerning the Every-Day Business of Stationers, Printers, Binders, and the Kindred Trades by Ford, J. Sawtelle
This he made manifest by looking through a bottle containing solution of chrome alum, when the central portion of the field of view appears of a light red colour for the first second or two.
From Heroes of Science: Physicists by Garnett, William
Both chrome alum and alum crystals are used for the same purpose in photography, for clearing and hardening the film of the negative.
From Harper's Round Table, August 13, 1895 by Various
They are: manganese dioxid, copper sulfate, cobalt chlorid, nickel salts, chrome alum, and silver nitrate.
From Common Science by Ritchie, John W. (John Woodside)
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
