Reactive Potential

Contains: Copper (Cu)
May React With: Selenium (Se) / Sulfur (S), Reactive styles (000009, 001009, 001019)

Cold Characteristics

Uniform colour.

Working Notes

A copper glass. May have dark colour reaction at interface with cadmium/selenium or sulphur glasses including 000125, 000120, 000124, 001120, 001125, 001122, 001137, 001437, 000137. Learn more about possible reactions by reading our Reactive Potential of Bullseye Glass chart. Fusible / Bullseye-compatible.

During processes that require greater heat work, 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 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 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.

Reaction Note: Copper-bearing Turquoise Blue fired on French Vanilla (sulfur-bearing) and White (does not contain lead, copper, or sulfur). Notice the earth-tone hued reactions where the various forms of Turquoise Blue and French Vanilla meet. There is no reaction with White on the lower portion of the tile.