Isn’t that the stuff that can potentially turn you blue?
‘Yeah, take this for your syphilis, you might turn blue. Don’t take it and you might DIE’.
Tough choice there if you’ve got a resistant strain.
Money might be had in figuring out how to prevent or reverse the blue though.
I think there was a treatment involving mercury in those days also.
Not silver based...
Arsphenamine (Salversan 606) is an organic arsenic compound...