ReactiveWhen certain glasses are fused next to each other, they can produce a chemical reaction in the areas where they melt together, showing as a thin line of color between the two glasses. System 96 Red Reactive Clear and Opal glasses form a red reaction when fused next to classes containing copper. Click here for more information about Reactive Glass.
Image: Patty Gray
(S) = Spectrum® (U) = Uroboros