It took me so long to answer Kristin's first question yesterday, that by the time I was finished I forgot about the others. Here are the answers to those as well.
Q: "Is there any perceived difference between the way different COEs behave?"
Yes. Generally speaking, the lower the COE the stiffer the glass, i.e., the higher the working temperature. That isn't universal, but it is usually the case.
Q: "I know you can't mix COEs. But , dream on, wouldn't it be great if ALL soft glass had the same COE and we could use ALL those yummy colours? So, is this likely to happen in our lifetime?"
Not a chance.
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