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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 29  1970
On the Role of Tin in Copper Ruby Glass
ATMA RAM, s. N. PRASAD, K. P. SRIVASTAVA AND s. s. PRASAD
Pages : 35-40
DOI : 10.1080/0371750X.1970.10855720
Abstract
Tin has so far been believed to reduce cuprous copper during the striking of copper ruby colour. The new view advanced recently on production of copper ruby colour does not involve tin in the striking mechanism. As tin is essential in large-scale production of copper ruby glass, its role has been investigated and is described in this communication. Copper ruby glasses of soda-lime-silica type, with and without tin were melted. The critical melting stage was found to be almost absent in glasses without tin whereas it lasted for a considerable period in glasses containing tin. The glasses melted without tin were grey yellow to yellow brown even on heat-treatment, indicating the presence of metallic copper. It suggests that Cu+ got reduced to Cuo in the melt. This does not happen when copper ruby glass is melted with tin. The .findings indicate that instead of Cu+, Sn++ might be getting preferentially reduced when tin is present. It would appear that Sn++ retards the reduction of Cu+ to Cu0 in the melt. Thus the duration of stability of Cu+ in the glass melt is extended and thereby the melt remains suitable for the production of red colour for a considerable period. Introduction I N recent years we have advanced the view tha tthe
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