Wissmach Blue Bell (color code 96-WO 188) is a Prisma sheet in COE 96 kiln glass, soft periwinkle blue with drifting white wisps in a 3mm sheet, tested for fusing compatibility.
Appearance A soft periwinkle blue with thin white and faint blush streaks drifting horizontally through it, like high cloud over an evening sky. The blue carries the sheet while the lighter wisps break it up in gentle layers. As with all of Wissmach's Prisma sheets, the streaking is unique to each sheet, so no two are identical.
Striking Wissmach notes its Opaque and Prisma colors may strike to a deeper or denser color after firing, so expect the fired blue a little richer than the sheet in your hand. 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 Blue Bell 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 it pairs 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
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