chrome alum

[ krohm al-uhm ]

noun

1. Also called ammonium chrome alum;. a green, crystalline, water-soluble powder, chromium ammonium sulfate, CrNH 4 (SO 4 ) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.
2. a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO 4 ) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.

chrome alum

noun

1. a violet-red crystalline substance, used as a mordant in dyeing. Formula: KCr(SO 4 ) 2 .12H 2 O

Example Sentences

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 Project Gutenberg

For special purposes chromium fluoride, chrome alum, &c., are employed.

From Project Gutenberg

The difference between chrome alum and alum crystals is principally that chrome alum has twice the strength of alum crystals, being a double salt, instead of the commercial alum usually sold.

From Project Gutenberg

It is made sensitive with a bath consisting of one part of chrome alum, 14 parts of water and 4 parts of alcohol.

From Project Gutenberg

By adding sodium phosphate to an excess of chrome alum the violet phosphate, CrPO4�6H2O, is precipitated; on heating to 100� C. it loses water and turns green.

From Project Gutenberg