Because the lead in glass makes in cleaner (free of bubbles) and allows full melt at lower temperatures, many prefer high lead content glass like Gaffer for casting. If I want to pour cast Spectrum or Bullseye, I have to melt to 1800F or higher and accept that it's relatively thick and won't cast into fine detail. If I use Gaffer, I can pour it at 1600F and it'll pick up hair thick detail. It's also near perfect clarity - free of bubbles. Gaffer is COE 96. Although it's the same COE as Spectrum, the difference in clarity is instantly recognizable. The difference in performance is even more dramatic. Spectrum pours like thick syrup - Gaffer like light oil.
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Dennis Brady
DeBrady Glassworks
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