No more comments, but ask yourselves these questions and do the research to find the answers if you really want to begin to understand glass.
1. What makes glass rods shocky?
2. What causes glass to need to be worked at lower temperatures or in the back of the flame?
3. What makes a glass stiffer even though it has the same coe as another glass?
4. What causes a glass not to flow so that it cannot be shaped in the flame?
5. What is "burning" glass really and why does it happen?
6. How can the chemical composition of glass be changed by adding heat?
7. What causes glass to foam?
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Pam
"It is easier to perceive error than to find truth, for the former lies on the surface and is easily seen, while the latter lies in the depth, where few are willing to search for it." Johann Wolfgang Von Goeth
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