Trautman Art Glass via Frantz Art Glass
Penumbra
A reactive silvered cobalt blue producing a wide variety of blues and greens; oxidizing flame favored, with different results from reduction. Haze does not burn off as easily as standard A/P silvers.
Outcomes
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Blues and greens with silvered haze in oxidizing flamePrefers an oxidizing flame; produces a wide variety of blues and greens. Note that the silver haze does not burn off as easily as it does on A/P rods.
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Different hues — altered blues/greens or shifted tones — when reducedReduction shifts the color outcome; specific resulting hue is not detailed but is described as distinctly different from the oxidizing result.
Working notes
- Silver haze does not burn off as easily as A/P silvers — allow extra time at high heat to clear it.
- Rod has been reformulated from the original version.