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Industrial Byproduct (Raw Slag Glass)• What it is: When historic iron smelters heated raw iron ore with limestone flux and charcoal (or coke), non-metallic silicate impurities separated from the molten iron. As this molten waste cooled, it formed a glassy, vitreous material.
• How it gets its color: The vibrant hues—such as deep cobalt blue, robin’s egg blue, purple, and green—are caused by trapped chemical oxides, iron, magnetite, or sulfur reacting as the material cools.
