Wissmach Midnight Blue Tr/Olive Green with Luminescent coating (base color code 96-35) is a Prisma blend in COE 96 kiln glass, dusky blue and olive green streaks in a 3mm sheet with an iridescent surface, tested for fusing compatibility.
Appearance A deep, dusky sheet where diagonal streaks of midnight blue and olive green run together, and the coating floats a muted shimmer of violet, plum and sea green over them that shifts with the light and viewing angle. The effect shows in ordinary room light. The first color in a Prisma name leads, so the midnight blue dominates with the green threading through, and the streaking is unique to each sheet, so no two are identical.
Striking This Prisma blend may strike to a deeper or denser color after firing, as Wissmach notes for its Opaque and Prisma lines. Expect a slightly richer result out of the kiln, and fire a sample chip when the exact shade matters.
Luminescent coating The Luminescent coating lays a smoky rainbow shimmer over the midnight blue and olive green base, drifting through violet, plum and sea green 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 carries the copper marker on Wissmach's COE 96 chart. In direct contact with a sulfur bearing color 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 two glasses touch. Test the pairing first, whether you want the line or want to avoid it.
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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