Here's a link on cleaning silver using a variation on the method described above:

And I have been searching for a picture of the "charro" style jewelry from Salamanca--I have a "botón" on a keychain and a lovely silver pin. The wallpaper on this page depicts one of the typical "buttons:"

Here's another link, with a reasonable photo:

And a few other photos here:

I get so many compliments on my silver "botón charro" pin--I wear it on the lapel of my winter jacket.

Tara smile