I’m making a liar out of me. Quoting the Oscar Branson books as
having the formula for blackening silver may have been a mistake.
Kay Vontz caught it by not seeing any reference to heating pieces or
boiling water. Now I have to find where the reference Was. Those
books stuck in my mind all these years as the source but I didn’t
double check before writing. Sorry. May have been an earlier
edition, or an article, but know that I was just starting to work
silver and Bransons books were among the earliest I bought. Boy,
now I have a ton of reference books. Will keep you posted. And there
is still a trove of wonderful in Branson - so do enjoy
and own them !