ammonium alum


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ammonium alum

[ə′mōn·yəm ′al·əm]
(inorganic chemistry)
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Ammonium hydroxide was treated with concentrated sulphuric acid for the preparation of ammonium alum. In this reaction the mole ratios of Al/SO4 were adjusted to 1:2 to 2.4.
The sections were subsequently stained with various alcoholic dilutions of the dye in acidic, alkaline and neutral media, with the use of 1% acetic acid, potassium ammonium alum and ethanol, respectively.