Spectrum T-Glass.The T stands for Transition, so named because it is often produced as Spectrum Glass shifts from one product to another in manufacture.
System 96 T-Glass is always 100% tested-compatible, devit-resistant, excellent-cutting, and otherwise top-performing fusible glass. It will, however, be outside of System 96's tolerances for surface texture, seeds, color hue, mix, or density.
Most surface imperfections will disappear in the fusing process. If you wish to retain them for effect, fuse at lower temperatures using shorter hold times. The more heat your project gets (the more full the fuse), the more an imperfect surface will heal.Avoid T-Glass where it is critical that you be able to replicate glass color from one project to the next.