method for production of a in the mass silberlegierung blackened.

摘要

PCT No. PCT/FR89/00057 Sec. 371 Date Nov. 3, 1989 Sec. 102(e) Date Nov. 3, 1989 PCT Filed Feb. 16, 1989 PCT Pub. No. WO89/08612 PCT Pub. Date Sep. 21, 1989.The present invention relates to manufacturing a silver alloy which is blackened throughout its bulk and used, for example, in jewelry. The method of manufacturing this material comprises putting the silver alloy into contact with sulfur in the form of sulfur vapor. The thickness of the wires or foils used in the method lies between about 1/10th of a millimeter and a few millimeters, and the time during which the silver alloy is exposed in the atmosphere of sulfur vapor is calculated as a function of this thickness. The silver alloy blackens due to sulfur/silver diffusion, and according to the present invention the silver alloy is heated to a predetermined temperature in order to optimize this diffusion as well as the microstructure of the resulting material.