Wissmach Blue Lake Transparent (color code 96-341) is COE 96 kiln glass, a glowing turquoise leaning blue transparent in a 3mm sheet, tested for fusing compatibility.
Appearance A bright turquoise blue with real glow where light comes through, deepening toward the edges of the sheet, with a softly rippled surface and a few scattered seeds typical of handmade rolled glass. It reads like clear tropical water in a single layer and shifts toward a deeper teal when doubled.
Working notes Wissmach’s recommended full fuse schedule for a 6mm project made from two 3mm layers: heat at 300 degrees F per hour to 1225 F and hold 30 minutes, then 600 per hour to 1460 F with a 10 minute hold, cool as fast as the kiln allows to 960 F and hold 1 hour, then 100 per hour down to 700 F. These numbers come from Wissmach’s current published firing guidance. They are guidelines, not guarantees. Kilns differ, so fire a small test piece first.
Reactions Blue Lake is a copper bearing color on Wissmach's COE 96 chart. Fired in direct contact with sulfur bearing colors such as String of Pearls, Gold Tone, Yellow or the red and orange family, it can form a darker copper sulfide line at the boundary. Test fire the combination first if 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.
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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