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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 05  1946
Faults found with various types of chrome greens and the methods of obviating them.
K. N. MADHAVA PANICKER, B. A.,
Pages : 76-78
DOI : 10.1080/0371750X.1946.10877798
Abstract
The stable oxide which imparts the various Rreen shades iq pottery colours and g-lazes is chromium oxide, Cr20 8 • Potassium dichromate is also used in green colour recipes. It gives a better mixing beingsoluble, and in the process of manufacturing- the g-reen colours the soluble potassium salts are removed by washing-. Although Cr203 gives its characteristic gret!n colours of various shades, the green colour can be completely altered or spoiled by other ing-redients present in the colour or tbe glaze, and also by the indiscriminate process of firing these colours. Chromium oxide gives a bright g-reen with lime but if barium oxide is present in the colour, it changes to yellow brown. Coppec oxide with Cr.Oa gives blue green, all these substances forming the respP.ctive chromates. But these chromates are ·not stable above easy glost temperature and so some of them can only be used in on-glaze colours. Chromium oxide itself when calcined is extremely inert and refractory.
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