Wissmach Orange Red Opalescent with Luminescent coating (base color code 96-40) is COE 96 kiln glass, an orange red 3mm sheet with an iridescent surface, tested for fusing compatibility. Wissmach lists the base color as Orange/Red.
Appearance The shimmer nearly takes over this one: broad horizontal bands of rose, peach, gold and lavender roll across the warm orange red base like a sunset sky. The pearl effect is strong enough that the sheet reads coral pink at some angles and richer orange at others, and it shows in ordinary room light with no special lighting needed.
Striking The base is one of Wissmach's Opaque colors, and the maker notes these may strike to a deeper or denser color after firing. Expect the fired orange red a shade richer than the raw sheet, and test a chip first if the final color is critical.
Luminescent coating The Luminescent coating lays a strong mother of pearl shimmer over the orange red base, rolling through rose, gold and lavender 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 a sulfur bearing color on Wissmach's COE 96 chart. Fired in direct contact with copper bearing colors such as Reactive Blue, Deep Sky Blue, Turquoise Green or Sea Blue, it can form a darker copper sulfide line where the glasses touch. Run a small test tile before committing the pairing.
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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