potash alum

American  

[pot-ash al-uhm] / ˈpɒtˌæʃ ˈæl əm /

noun

Chemistry.

1. alum.

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potash alum British  

noun

1. the full name for alum

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Etymology

Origin of potash alum

First recorded in 1830–40

Example Sentences

Common alum is strictly potash alum; other two varieties are soda alum and ammonia alum, both similar in properties.

From The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide by Various

Nitrat of potash, oxygenated muriat of potash, alum, sulphat of soda, &c. are examples of this circumstance, as, to make these salts cristallize, refrigeration must be added to evaporation.

From Elements of Chemistry, In a New Systematic Order, Containing all the Modern Discoveries by Lavoisier, Antoine

Further, the hair-like alum of Dioscorides, repeated by Pliny below, was quite conceivably fibrous kalinite, native potash alum, which occurs commonly as an efflorescence.

From De Re Metallica, Translated from the First Latin Edition of 1556 by Agricola, Georgius

It is quite a matter of indifference to the photographer whether he uses potash alum or ammonia alum.

From Scientific American Supplement, No. 401, September 8, 1883 by Various

Portions of the gum solutions were mixed with small quantities of menthol, thymol, salol, and saccharin in alkaline solution, also with boric acid, sodium phosphate, and potash alum in aqueous solution.

From Scientific American Supplement, No. 821, September 26, 1891 by Various