Contains

Copper

May React With

Selenium, Sulphur, Reactive (000009, 001009, 001019)

Cold Characteristics

Uniform colour.

Working Notes

A copper glass. May have a dark colour reaction at the interface with cadmium/selenium or sulphur glasses, including 000125, 000120, 000124, 001120, 001125, 001122, 001137, 001437, 000137. 

During processes that require a greater network, such as pattern or flow bar techniques, Turquoise Blue Opalescent has the potential to deposit trace amounts of copper on the surface of the kiln shelf. These deposits may react with sulphur-bearing glasses in subsequent firings. Such deposits may not be visible and can react even when the shelf has been properly scraped and reprimed or when ThinFire has been removed and a new ThinFire is applied. This type of contamination is impermanent and may be burned out/fired out throughout subsequent firings. A contaminated shelf can be fired with glasses—other than sulphur-bearing glasses—and no reaction will take place. In our studios, we've observed the greatest contamination in subsequent firings with sulphur-bearing French Vanilla Opalescent (000137) and Spring Green Opalescent (000126). For a burnout firing, we recommend a rate of 300°F/hr to 1525°F, with a hold of 1:00 hour.