Old-fashioned term for ammonium chloride.
- The dissolutive water is made from vitriol of Cyprus, saltpetre (potassium nitrate), Jamenous Allom, and sal ammoniac (ammonium chloride), and it became known as aqua regia, the king of waters.
- Upon burning, the dung produced acrid vapors and would leave behind a white residue which they called sal ammoniac, meaning salt of Ammon.
- Wollaston paid careful attention to the waste solutions that remained after the precipitation of the platinum salt of sal ammoniac, being curious about the nature of any non-platinum components.
Middle English: from Latin sal ammoniacus 'salt of Ammon' (see ammoniacal).
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