Contains Low Amounts of Sulfur, May React with Copper Bearing Glasses. Reaction occurs when certain glasses are fused next to each other, they can produce a chemical reaction in the areas where they melt together. This is caused when elements, or ions, in the two glasses, actually mix with one another, changing the chemistry where they meet. The result of this chemical change shows a thin line of colour between the two glasses. A bubble squeeze may be required in fusing, to reduce the bubble.

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