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roche alum
[ rohch ]
noun
, Chemistry.
- an alumlike substance derived from alunite.
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Word History and Origins
Origin of roche alum1
1400–50; roche cliff, rocky height (now obsolete), late Middle English ( rock 1 ); apparently partial translation of Middle French alum en roque, alun de roche
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Example Sentences
Or, wash the brass-work with a strong solution of roche alum, and polish it with tripoli.
From Project Gutenberg
If one ounce of powdered roche-alum be put into a cask of four gallons of wine, it will make it fine and brisk in ten days.
From Project Gutenberg
A strong lye of roche alum and water also improves the appearance of brass.
From Project Gutenberg
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