| 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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