Kat, it's possible to get a customer to cooperate and let
you do a litmus test,
G’day; Sorry, but I doubt that a litmus test will help very
much. Firstly you would have to use something a bit more
sensitive than litmus, such as one of the pH papers (sometimes
sold in gardening shop) but such a paper would have to be wetted
with a drop of neutral water - even water from a still would very
rapidly dissolve carbon dioxide from the air to give a slightly
acid solution, making the test unreliable. Next what
discolours silver and the lower carat golds is sulphides, not
just acids. Sweat contains sulphur compounds, even that of the
cleanest people. The quantity of sulphur compounds in sweat
depends upon a very large variety of factors, heredity and diet
being only two of them.
I’m afraid that people who find their jewellery staining have
four options: keep it clean; wear only high carat gold (18ct
and above); move away from the city; don’t wear any!
/ /__| \ @John_Burgess2
At sunny Nelson NZ in late winter/early spring with lambs, daffs, tree
blossoms, Cold starry nights, cold sunny days Only it’s foggy right now!