Greasy Glass
Marina
Copper-based blue best worked in an oxidizing flame or encased; always preheat tube before use to prevent thermal shock.
Outcomes
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rich copper-based blue in oxidizing flame or when encasedWork in an oxidizing flame or encase to achieve the best blue result. Always preheat tube slowly before use to prevent thermal shock.
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altered hue if worked in reducing flame (copper-based glass may shift or dull)Copper-based glasses are sensitive to flame chemistry; reducing flame may shift or dull the blue. Oxidizing flame or encasement is recommended.
Working notes
Preheat / heat slowly
- Always preheat tube before use to prevent thermal shock.
- Copper-based glass — avoid reducing flame to maintain blue color.