Wissmach Pumpkin Orange Transparent with Luminescent coating (base color code 96-18 LLL) is COE 96 kiln glass, a hot pumpkin orange 3mm sheet with an iridescent surface, tested for fusing compatibility.
Appearance The base is a strong red leaning orange, scattered with the small dark seeds of handmade rolled sheet, and over it the coating lays a soft rose and gold sheen that drifts in faint vertical bands. On this dense a color the shimmer reads as a subtle satin glow rather than a full rainbow, and it shows in ordinary room light as the viewing angle changes.
Luminescent coating The Luminescent coating adds a soft rose and gold sheen over the pumpkin orange base, shifting across the surface 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 glass 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 run it against blues, greens and neutrals without planning around reaction chemistry.
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
Spot an error or have feedback on this description? Report it here .
