Wissmach Oyster Pearl/Reactive Blue (color code 96-39) is a Prisma blend in COE 96 kiln glass, warm pearl and soft blue streaks in a 3mm sheet, tested for fusing compatibility.
Appearance Vertical ribbons of warm sand, olive and ivory pearl run the length of the sheet, parted by a soft aqua blue band, all with the cloudy depth that comes from blending an opaque into the mix. The first color in the name is the more dominant, so the pearl tones lead here with the blue threading through. The streaking is unique to each sheet, so no two are identical.
Striking Like the rest of Wissmach's Opaque and Prisma palette, this blend may strike to a deeper or denser color after firing, so plan on the fired piece reading a little richer than the raw sheet. A quick sample chip settles the question if the final 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 carries both markers on Wissmach's COE 96 chart: Reactive Blue brings copper and Oyster Pearl brings sulfur. In direct contact with neighbors from either family it can form darker reaction lines where the glasses touch. Results depend on batch, temperature and combination, so test fire the pairing before committing a project.
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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