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Why is a yellow frame observed around the point where glass is heated?

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When glass is heated, a yellow flame is observed around the point of heating. What does the yellow flame indicate? Why is it observed when glass is heated?

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Solution provides a brief explanation of what the yellow flame is when glass is heated and why it is observed.

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When glass is heated, the yellow flame that is observed around the point of heating is a result of the fact ...

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