Ammonia alum



.
a crystalline solid, AlNH 4 (SO 4) 2 ⋅12H 2 O, used chiefly as a size in the manufacture of paper; alum.
Historical Examples

Common alum is strictly potash alum; other two varieties are soda alum and ammonia alum, both similar in properties.
The New Gresham Encyclopedia. Vol. 1 Part 1 Various

In ammonia alum there is no more mineral substance than in cream tartar.
Scientific American, Vol. XXXIX.–No. 24. [New Series.], December 14, 1878 Various

It is quite a matter of indifference to the photographer whether he uses potash alum or ammonia alum.
Scientific American Supplement, No. 401, September 8, 1883 Various

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    (def 2). Historical Examples A saturated solution of potassium carbonate may be substituted for the ammonia solution. The Barnet Book of Photography Various A third is made with tartaric acid and nitrate of silver, dissolved in ammonia solution, and coloured. Poisons: Their Effects and Detection Alexander Wynter Blyth Tea should not turn black upon immersion […]

  • Ammonia water

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