BE - 0116 Turquoise Blue Opal Sheet
May React With
Selenium, Sulfur, Reactive (000009, 001009, 001019)
A copper glass. May have dark color reaction at interface with cadmium/selenium or sulfur glasses including 000125, 000120, 000124, 001120, 001125, 001122, 001137, 001437, 000137.
During processes that require greater heatwork, such as pattern or flow bar techniques, Turquoise Blue Opalescent has the potential to deposit trace amounts of copper on the surface of the kilnshelf. These deposits may react with sulfur-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, alternatively, when used ThinFire has been removed and new ThinFire is applied. This type of contamination is impermanent and may be burned out/fired out over the course of subsequent firings. A contaminated shelf can be fired with glasses—other than sulfur-bearing glasses—and no reaction will take place. In our studios, we've observed the greatest contamination in subsequent firings with sulfur-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.