Wissmach Midnight Blue Transparent/ Crystal/ Irish Green Transparent/ White with Luminescent coating (base color code 96-WO 197) is a Prisma blend in COE 96 kiln glass, deep sea colors under an iridescent surface in a 3mm sheet, tested for fusing compatibility. Wissmach's own name for the blend is Ocean.
Appearance Bands of midnight blue, teal and sea green flow across the sheet in horizontal currents, with milky white and golden olive drifting through and the coating adding a soft violet and pearl sheen over all of it, like water at dusk. The first color in the name is the more dominant, so midnight blue leads the blend. The streaking is unique to each sheet, no two are identical, and the shimmer shows in ordinary room light.
Striking Wissmach notes that its Opaque and Prisma colors may strike in the kiln, so expect the fired blues and greens to come back a shade deeper and denser than the unfired sheet. Fire a sample chip if the exact depth matters to your design.
Luminescent coating The Luminescent coating lays a mother of pearl shimmer over the deep ocean blend, drifting through violet, aqua and gold as the light and viewing angle change. The coating is a low fire surface layer and it is heat sensitive. Fired face up, heat and oxygen can burn it away. Wissmach recommends reverse fusing with the coated face down on a flat kiln shelf and keeping the top temperature at 1400 F or below. Do not cap the coated surface with clear glass, capping makes the coating disappear. Keep any later firings below 1250 F. For a full fuse with two 3mm layers, Wissmach’s Luminescent schedule runs 400 degrees F per hour to 1225 F with a 30 minute hold, then 600 per hour to 1400 F with a 10 minute hold, cooling as fast as the kiln allows to 960 F for a 1 hour hold, then 100 degrees F per hour down to 700 F. Results vary sheet to sheet, so test fire a small piece first.
Reactions The base blend is copper bearing on Wissmach's COE 96 chart. Fired in direct contact with sulfur bearing colors such as String of Pearls, Oyster Pearl, Gold Tone, Honey or the red and orange family, it can form a darker reaction line where the glasses touch. Test the pairing first when the effect matters.
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 without the coating (plain sheet) .
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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