Wissmach Black (color code 96-02) is COE 96 kiln glass, a dense jet black opaque in a 3mm sheet, tested for fusing compatibility.
Appearance A deep, even black with a glossy surface and no visible streaking or variation across the sheet. As an opaque it blocks light completely, reading the same solid black on a lightbox or a tabletop, which makes it a dependable anchor for backgrounds, silhouettes and high contrast layered work.
Striking Wissmach notes that its Opaque and Prisma colors may strike to a deeper or denser color after firing, so the fired sheet can come out a touch richer than it looks unfired. Fire a sample chip first if the exact tone 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 Black 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.
More of this color Also available in a thin 2mm sheet · with a Luminescent coating · 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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