An elegant and calming blue, giving your work a touch of class. Perfect for eye-catching patterns and for contrasting with lighter colours, especially silver.
May have dark colour reaction at interface with cadmium/selenium or sulphur glasses. May have a red-hued colour reaction with reactive glasses.
Copper Blue may deposit a residue onto shelf releases (Thinfire, primer etc.) when firing to a full fuse or hotter. Scrape and thoroughly buff off used primer, then apply fresh primer; or remove used Thinfire and replace with new to avoid possible contamination effects in subsequent firings. These contamination effects are essentially reactions, possible when Selenium, Sulphur and Reactive styles are fired while in contact with a copper-contaminated separator.
This photo shows an example of the French Vanilla glass reaction resulting from contaminated separator on the right side. The left side has had the primer thoroughly removed and new primer applied.
This glass may develop a sheer, dark grey film upon firing to low tack fuse temperatures such as 690°C.
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