For copper based alloys ammonium sulphide makes a bery dense, black
patine. Can be lessened by “fuming” the piece (passing it close to the
bottle and into the vapors). It will “polish or rub” off with elbow
grease. Stainless is much more difficult, that is why it is called
stainless. There are metal dyes available that are used in industrial
applications to “mark” metal pieces with particular characteristics and
what have you. Don’t know who actually makes the stuff but I bet you could
fine it under metal dyes in Thomas Register.
John and Cynthia/MidLife Crisis Enterprises
Maiden Metals/C. T. Designs/ Bloomin’ Wax Works. etc.
PO Bx 44, Philo
Ph 707-895-2635 FAX 707-895-9332
The playfulness of the Universe
is reflected in the dance of the stars!