The first thing to remember when fusing dichroic glass is that, like all glass used in glass fusing, it must be compatible. Regular window or float glass is generally incompatible, so it should be avoided.
Take a look at some glass suppliers and explore their selection of patterns. Along with the description, you will see that each piece of glass has a COE number, usually 104 or 90. You must fuse the glass with glass from the same COE and must not cross them. Mixing the COE results breaks as the glass expands and contracts during the cooking process.
COE, or the coefficient of expansion, is simply a measure of the degree of expansion that glass passes through as it is heated.
CBS Patterned Dichroic Glass can come in either a clear or black base. In black it can be used as a base. It is best to use it on a darker base as the coating can become almost invisible in sunlight.
If you are using more than one layer of dichroic glass, you must remember that the coated sides must not touch each other. Remember that the coating is a metal oxide. Having two of these directly connected means that the glass cannot fuse properly, resulting in ruined patterns of deformed glass.
Glass coating is more delicate than art glass, although it is compatible with most. Generally speaking, it should not be taken at temperatures of 810 degrees Celsius, although personally shooting above 800 is considered risky. However, temperatures can vary greatly from oven to oven. Be careful when using glue with dichroic glass. Overuse can cause the liner to spoil as it burns in the oven.