Well I'm really going back sometime on this and further recollection was a smith doing it as a full job and getting the right effect. But you are very right about it being a dying artform and as Harry Bonar has said fooling around with old steels can lead to disaster. The shotgun is a 1892 "Gold Name" boxlock ejector which was made when they were in Pall Mall, London, England for about 20yrs so it is a bit of a collectors item, maybe. I got in touch with Westley Richards and they sent me copies of the original sales leger entry and its history up to 1964. the original owner had it for 50 yrs then a good friend of mine had it until 1995 when he gave it to me, he died about 3yrs after. I have had the stock replaced as it was worn out ( recut about 4 times) and have made new ejector springs for it, I can shoot good with it ( partly why he gave it me! ) and it has great sentimental value. He had it serviced back in the 80s and the bonehead who did it, polished out the color hardening saying it was old fashioned and shiney was nicer!!!!!! ?for th reasons above there is no way I would attempt to re-harden it as it would most likely scrap the action body and even though WRs would make a new one for around 5k $ it would spoil the originality apart from being a lot of money. So the color in a bottle sounded good!!