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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 18  1959
CERAMICS
Pages : 89-117
DOI : :10.1080/0371750X.1959.11011916
Abstract
Chrome alumina pink ceramic colours. N. S. Gopala Rao, Cent. Glass & Ceram. Res. Inst. Bull., 5, 25 (1958).-Investigations were carried out to study the effect of zinc oxide, quartz, boric oxide, calcia and magnesia on chrome alumina pink ceramic colours. At calcination temperature of 1300C with 3 per cent potassium dichromate, some of the successful pink colours were : (i) Al.Oa 20, ZnO 40 and B30a 40-dark rose pink, (ii) AbOa 20, ZnO 40, B20a 20 an4 Si02 17.23-dark rose pink and (iii) AlaOa 60, CaO 20, and B20a 20-brick red colour. Calcia, added as calcium carbonate, though not found to be necessary to produce pink colour, was found to lower the required temperature of calcination and to deepen the colour. The best shades of pink were obtained in the presence of zinc oxide, boric oxide, calcia and quartz. Calcination at temperatures higher than 1300C was found to deepen the colour with an optimum at 1450oC. Addition of 10 per cent red lead lowered the calcination temperature and deepened the colour.
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