The 1.5" buckles we're using on our collars have a coating on them which is preventing them from oxidising. All the other bits are aging nicely, but the buckle stands out because it stays looking new and shiny. We have a liquid for dipping things in to oxidise them, but the buckle doesn't react. It seems to be coated with something. Sanding it off is an option, but I'd rather not have to! Would paint stripper work? Or something else?
I don't have a picture of the buckle handy, but it's the 718 SB 1.5" on p82 of the Weaver catalog.
Thanks