Oxidising a.k.a Blackening

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 acts as a .............. (missing from doc)

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