Wissmach Midnight Blue Transparent/ Irish Green Transparent/ Crystal (color code 96-197 LL, Wissmach's name for it is Malibu) is a Prisma blend in COE 96 kiln glass, sea blues and greens swirled with crystal in a 3mm sheet, tested for fusing compatibility.
Appearance Blues and greens swirl together with paler crystal wisps, green pooling at one end of the sheet and clear azure blue at the other, like shallows meeting deeper water. Midnight Blue is the first color in the name and the more dominant, with Irish Green and Crystal marbling through it, and a scatter of fine seeds rides in the glass. The streaking is unique to each sheet, so no two are identical.
Striking Wissmach's Opaque and Prisma colors may strike to a deeper or denser color once fired, so expect Malibu to come out of the kiln a little richer than it went in. A quick sample chip settles the question if the exact shade matters.
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 This blend is copper bearing on Wissmach's COE 96 chart. Fired in direct contact with sulfur bearing colors 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 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.
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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