chrome alum

American  

[krohm al-uhm] / ˈkroʊm ˈæl əm /

noun

1. 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.

2. a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO4 ) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.

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chrome alum British  

noun

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

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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

What is the difference between chrome alum and alum crystals.

From Project Gutenberg

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 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