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 254
AND SULPHATES OF IRON 239 This alum, however, is not yet pure enough for sale as it is, and, moreover, is not in a merchantable form. It therefore FIG. 152. — Copper syphon. must be re-crystallised a second time, and for this purpose is re-dissolved by the aid of direct steam, in special vats,… … FlG. 153. — Copper vat with underneath fire. of lead, slightly wider at the top than the bottom, and fitted with a false bottom of pumice or thick sheet-lead.
Alum · Sulphates · Dyes and dyeing · Chemistry, Technical
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