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In Martin's above article, it is interesting how strops were sold in coffee-houses.

Yeah! Someone may also have found a magical cave of chalky-green miracle stuff.
Sold it, but never said anything about where it came from!
Har!

Oh sorry, Spendur. As to making it, I think you are correct.
As in the Wiki-links article I quoted above, it WAS naturally-occurring well before then!
Just by a different name!

I don't know a thing about Chromium Oxide, to be certain. There may have been another form of it.
Certainly red and green strop pastes go back before when, which must have been somewhat lightly...

Cool, Martin!
I wonder if the 'green' was not with a bit of CroOx? ;)