Wissmach Emerald Coast Transparent with Luminescent coating (base color code 96-18) is COE 96 kiln glass, a rich sea green 3mm sheet with an iridescent surface, tested for fusing compatibility.
Appearance The surface reads as a shifting patchwork of sea green, deep blue and lavender, with the emerald base glowing through wherever the shimmer thins. Tilt the sheet and the patches slide and trade places, teal one moment and violet the next. The effect shows in ordinary room light, no special lighting needed.
Luminescent coating The Luminescent coating lays a mottled rainbow shimmer over the emerald green base, shifting through teal, deep blue and soft violet 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 Emerald Coast, a copper bearing color on Wissmach's COE 96 chart. In direct contact with sulfur bearing colors such as String of Pearls, Oyster Pearl, 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 to your design.
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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