This part of the process is for highlighting details on the piece, seen through the blackened areas within the engraved sections of a design.
This is performed by heating the piece and then submerging in a solution called Liver Of Sulphur, which is sulphur concentrate. Once this is done, the piece is returned back into a setting solution. The sulphur reacts with the base metal in the Sterling Silver to blacken the surface of the ring. During the polishing process, we'll remove the blackened areas of the silver which will have a high polish and the detailed/engraved areas will remain blackened.