The manufacture of alum and the sulphates and other salts of alumina and iron; their uses and applications as mordants in dyeing and calico printing, and their other applications in the arts, manufactures, sanitary engineering, agriculture, and horticulture (1901)
Geschwind, Lucien, Salter, Charles Thomas · London, Scott, Greenwood & son; New York, D. Van Nostrand co. [etc., etc.] · leaf 46
AND COMPOUNDS OF THESE METALS 31 B. POTASSIUM (POTASH) ALUM. — I. Ordinary Alum (SO4)3A12, SO4K2 + 24H2O. — In the laboratory this salt is prepared by dissolving and crystallising together equivalent proportions of pure aluminium sulphate and potassium sulphate. It may be purified by successive… … FIG. 15. even in small amount, is present ; otherwise separation is very difficult, if not quite impossible. When dissolved, alum exhibits an acid reaction and a sweet flavour with an astringent after-taste. It crystallises in regular octahedra, which may be obtained of large size, colourless, and…
Alum · Sulphates · Dyes and dyeing · Chemistry, Technical
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