Jeweller's rouge for polishing plate is a fine red iron oxide prepared by calcination from ferrous sulphate (green vitriol).
Clerkenwell is a centre of the watch-making and jeweller's industries, long established here; and the Northampton Polytechnic Institute, Northampton Square, a branch of the City Polytechnic, has a department devoted to instruction in these trades.
Signs were hung out on all sides to allure him; some to catch him by the appetite, as the tavern and victualling cellar; some by the fancy, as the dry goods store and the jeweller's; and others by the hair or the feet or the skirts, as the barber, the shoemaker, or the tailor.
Ferric oxide is employed as a pigment, as jeweller's rouge, and for polishing metals.
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