Working Notes for 2019 Glass Releases, Fall

July 29, 2019

Sheet Glass

Copper Blue Transparent 001246

Contains
Copper

May React With
Selenium, sulfur, and reactive glasses

Cold Characteristics
Uniform color

Working Notes
May have dark color reaction at interface with cadmium/selenium or sulfur glasses. May have a red-hued color reaction with reactive glasses.

Copper Blue may deposit a residue onto shelf releases (ThinFire, primer) 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, Sulfur and Reactive styles are fired while in contact with a copper-contaminated separator.

Example of French Vanilla glass reaction resulting from contaminated separator (right side); the left side had primer thoroughly removed and new primer applied.

May develop a sheer, dark gray film upon firing to low tack fuse temperatures such as 1275°F (690°C).

Fusible / Bullseye-compatible.

Pewter 001229

Cold Characteristics
Uniform color

Working Notes
Stable. No color change upon firing.

Fusible / Bullseye-compatible.

Color comparison of Light Silver Gray Transparent 1429, Pewter 1229, and Charcoal Gray Transparent 1129.

Copper Blue and White Streaky 002146

Constituent Glass
Copper Blue 001246 and White Opalescent 000113

Working Notes
May develop a subtly rippled or wrinkled surface upon slumping. Cap with clear to obtain more uniform, smooth textures in slumped works.

Texture (left) vs Clear cap (right) on 2146

After firing 2146 to a full fuse or hotter, remove used separator products such as Primer and Thinfire thoroughly to avoid possible contamination with sulfur-bearing glasses in a subsequent firing. See notes for Copper Blue, 1246.

Fusible / Bullseye-compatible.