12" x 12" Spectrum System 96 Fusing Glass pieces - Four pieces of Transparent glass taken from our factory clearance boxes in COE 96 fusing glass. Mid Purple, Light Olive Green, Golden Amber and Light Grape.
This is a Spectrum "t glass", so we cannot guarantee this shade will be the same with each sale 12"x12" transparent, or that it will be the same as the corresponding transparent in the main standard fusing range. (for a full description of what "t glass" is, see below)
The glass is easy to cut and perfect for anyone trying glass fusing, stained glass or copper foil making. All pieces are approximately 3mm thick.
JUST WHAT IS SPECTRUM "T" GLASS?
If you've been buying and using Spectrum glass for awhile, no doubt you've run across the phrase "T-Glass". Ever wonder what it really is and how it comes about?
Originally, the "T" stood for "transition". Spectrum used it to designate glass colours that were produced during the transition from one colour to another in their continuous-melt furnaces. For example, if they were producing dark blue and wished to change the colour to medium blue, a shade between the two might be made as the glass gradually changed colour. There was nothing really wrong with the T-Glass, it was just lighter than one standard shade and darker than another. But in order to maintain the integrity of their standard colours, these "in-betweens" had to be segregated out.
Colour is just one characteristic that goes into defining a standard. As Spectrum's quality control systems evolved so did their tolerances with regard to other glass properties. Each product was soon being judged for surface texture, mix proportion, light transmission and other qualities. When a glass fell outside the tolerance range, it also received a T-Glass classification. So T-Glass came to encompass any glass we Spectrum that, for one reason or another, falls outside the QC limitations for its standard.
Structural tolerances are a different matter altogether. These are glass problems that translate into poor cutability, sheet warp, or structural weakness. Glass is not classified T-Glass for these reasons. In fact, when these problems occur, the glass is not classified at all; it is trashed. So if you buy T-Glass, you can depend on it cutting just as well as any other Spectrum product.
T-Glass is often a fine buy and a good way to save money on glass. The most common problem people encounter is needing to match it in the future. Spectrum don't make T-Glass on purpose, of course, so availability is never assured. Plus, T-Glasses with the same stock numbers may be quite different. A glass called T/132W from one run may have an inadequate texture. The same glass from another run may be off in color. Keep these things in mind when you order T-Glass.