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just to be clear. If you don't use lead and selenium in a ruby glass, at the best it will be weak in color but more likely to not strike at all. Tin is used in old formulas, I've used it but not without the prior mentioned materials.
Big molecules reflect light. Small molecules tend to allow transmissivity. You should melt a few pots of it and gain some real world understanding.
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Where are we going and why am I in this basket?
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