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 as a thin line of color between the two glasses. (See the reaction between glasses containing Copper and Sulfer shown at right.)
A color reaction can occur between formulas of many glass colors. Learn more about System 96 Reactive Glasses by downloading the PDFs below.