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

This was the common potash alum and uncombined with any carbonated alkali, and it passed into the stomach unchanged.

From Project Gutenberg

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

From Project Gutenberg

For example, episomorphs of white potash alum and violet chrome alum, of white magnesium sulphate and green nickel sulphate, and of many other pairs of salts, have been obtained.

From Project Gutenberg

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 Project Gutenberg

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

From Project Gutenberg