Wissmach White/ Superior Blue (Wissmach lists it as Cornflower Blue Tr/White, color code 96-23) is a Prisma blend in COE 96 kiln glass, pale cornflower blue drifting through milky white in a 3mm sheet, tested for fusing compatibility.
Appearance A soft, milky white field with pale cornflower blue washing through it in gentle vertical drifts, more a watercolor blend than hard banding. Prisma is Wissmach's blend of two or three colors in one sheet, and the first color in the name is the more dominant, so white carries this sheet with the blue moving quietly through it. 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. Expect the blue to come back a touch richer than it looks unfired, and fire a sample chip first 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, so you can pair it freely across the palette.
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.
Helpful downloads Wissmach COE 96 Kiln Glass Catalog
Technical data courtesy of the Paul Wissmach Glass Co.
Description updated: August 13, 2026
Spot an error or have feedback on this description? Report it here .
