Richie,

> I changed "Saffron back to "Sulfur".

Just picking up on this one detail, it seems to me that saffron makes better sense, being an intense yellow rather than pale yellow. And saffron is the gloss in the document that Mick linked to. Saffron also had (and still has ) an associated industry; we still have a town in England called Saffron Walden; so it was something that a lot of people would have heard of, even if few could afford it. Whereas most people apart from alchemists would not have heard of sulphur by that name, though they might well have heard of "brimstone".