Patent ID: 7628903

Claim:
A silver and silver alloy plating bath, comprising: (A) a soluble salt, comprising a silver salt or a mixture of a silver salt and a salt of a metal selected from the group consisting of tin, bismuth, cobalt, antimony, iridium, indium, lead, copper, iron, zinc, nickel, palladium, platinum, and gold; and (B) at least one aliphatic sulfide compound comprising a functionality selected from the group consisting of an ether oxygen atom, a 3-hydroxypropyl group, and a hydroxypropylene group, with the proviso that the aliphatic sulfide compound does not comprise a basic nitrogen atom, the at least one aliphatic sulfide compound of (B) comprising 3,6-dithiaoctane-1,8-diol represented by the formula: HOCH 2 CH 2 S—CH 2 CH 2 —SCH 2 CH 2 OH.