We know when it was officially discovered, but the odds are alchemist before had discovered white phosphorus, and in turn discovered red phosphorus with increased heating of the white. I think my theory matches perfectly with the color described as well as "some" of the traits. Of course phosphorus does not make gold, therefore it must not be the stone right ? Despite the fact that nobody has proven that any of the text accurately describe ANY process of producing gold. Odds are much of the text are fluff content because they found some cool glowing red stone and they told everyone they could make gold, and maybe the yellow version of phosphorus had been found before and assumed to be gold. Either way, my theory cannot "fail" if you cannot tell me how the stone is made. The text are subjective.
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