Stained glass is also referred to as Art glass. It comes in a variety of colors. You can not mix this glass because of not knowing the COE of each piece. There is a lot of difference between fusible glass and glass that is not created for fusing purposes.
This glass typically slumps at around 1150 degrees Fahrenheit. At this temperature, the edges will not round, but will remain square. If you want rounded edges, you would have to go to a temperature of about 1375 degrees Fahrenheit, or do some cold work before firing. Do a test firing with some small pieces of your glass. This glass can sometimes change color, or even crumble in the kiln.
If slumping a piece that has not been fired to a high temperature yet, you will need to do some cold work before firing. This would involve using a grinder or some other method to round your corners and smooth off any sharp edges.
Stained glass doesn’t slump the same as the fusible glass. Watch your piece as you are slumping. Art glass contracts at a faster rate than ceramic molds, so if slumping over a ceramic mold you will need to anneal slowly. If cooled to quickly, the glass will crack.
When annealing this glass, hold for about 30 to 60 minutes at 960 degrees Fahrenheit. This holding will ensure that the glass has distributed the heat evenly throughout the glass. Then bring the glass down at about 100 degrees per hour until it reaches around 700 degrees Fahrenheit. At that point it should be safe to turn the kiln off.
500 degrees Fahrenheit per hour to 1000 degrees Fahrenheit and hold for 20 minutes
850 degrees Fahrenheit per hour to 1250 degrees Fahrenheit and hold for 20 minutes
Cool down as fast as possible to 950 degrees Fahrenheit and hold for 1 hour
500 degrees Fahrenheit per hour to 100 degrees Fahrenheit and turn off kiln
If you mess up, recycle the glass. It can be crushed or broken and then fused together for texture. These pieces can then be used in a pot melt, crushed up and put inside a mold, etc. Remember that you can't mix the glass because of the different COE factors.
Some art glass contains lead, so be sure you don’t make any food serving dishes or containers out of this material. Kilns that have been used to fire lead or other exotic glazes can produce fumes that can coat your glass making it not usable for anything that can be used to hold food.
There are a lot of individuals who have done stained glass and now are venturing into the world of fused glass. Using stained glass for fusing can sometimes cause you to end up relearning how to fire glass when you begin to work with fusible glass, because of the difference in the way it reacts inside the kiln.
Try incorporating some of your fused glass pieces into your
stained glass artwork
. This can help you add some details that can't be obtained in standard stained glass work.