Wissmach Crystal/ Superior Blue (color code 96-24) is a Prisma blend in COE 96 kiln glass, a breath of blue drifting through clear crystal in a 3mm sheet, tested for fusing compatibility. Wissmach's own name for the blend is Cornflower Blue Tr/Crystal.
Appearance Most of the sheet is a pale, icy wash where the crystal carries only a hint of cornflower blue, with fine vertical streak lines and the color gathering a little denser toward one edge. Scattered seeds and small bubbles pick up a darker blue rim where the tint concentrates. The first color in the name is the more dominant, so crystal leads here with the blue weaving through it, and the streaking is unique to each sheet, so no two are identical.
Striking Wissmach notes that its Opaque and Prisma colors may strike to a deeper or denser color after firing, so plan on the fired result coming out a little richer than the pale sheet in your hand. Fire a sample chip if the exact shade matters.
Working notes Wissmach’s recommended full fuse schedule for a 6mm project made from two 3mm layers: heat at 300 degrees F per hour to 1225 F and hold 30 minutes, then 600 per hour to 1460 F with a 10 minute hold, cool as fast as the kiln allows to 960 F and hold 1 hour, then 100 per hour down to 700 F. These numbers come from Wissmach’s current published firing guidance. They are guidelines, not guarantees. Kilns differ, so fire a small test piece first.
Reactions This blend is not flagged on Wissmach's COE 96 reactive chart. It sits next to any color in the line without forming a reaction line, which makes it an easy background or filler in mixed palettes.
Format and sizes Sold as a 3mm sheet in 8" x 10.5", 10.5" x 16" and 16" x 21" sizes. Choose your size from the options on this page.
Fusing and compatibility Tested compatible with other Wissmach COE 96 kiln glass. With glass from other makers, a matching COE number alone does not guarantee compatibility, so fire a test tile before committing a project.
More of this color Also available with a Luminescent coating .
Helpful downloads Wissmach COE 96 Kiln Glass Catalog
Technical data courtesy of the Paul Wissmach Glass Co.
Description updated: August 13, 2026
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