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 pot-ssium carbonate may be subst-tuted 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 […]
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(def 2). historical examples the ammonia water may be made of any strength by diluting if necessary. the boy mechanic, book 2 various the chalk is cheap and can be procured with the ammonia water. the boy mechanic, book 2 various the ammonia water furnishes large quant-ties of salts to be used, among other applications, […]
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ammonia-lyase ammonia-lyase n. any of various enzymes that remove ammonia or an amino compound by breaking the c-n bond, leaving a c=c.