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CT Jack · 07-18-2016, 08:56 PM

The raven finish you are looking for is technically called black oxide. If you have a shop nearby that does heat treating and various types of metal plating and finishing they usual have the black oxide process. If you have a sizeable amount they might reprocess them for you. I have tried using naval jelly rust inhibitor which will turn bare steel to a matt black finish. I applied some to my antique tractor splined axle about 10 years ago and it still hasn't rusted.

07-18-2016, 08:56 PM	#7
CT Jack Senior Member Join Date: May 2010 Location: Hebron, CT Posts: 432	Re: Darkening original engine bolts... The raven finish you are looking for is technically called black oxide. If you have a shop nearby that does heat treating and various types of metal plating and finishing they usual have the black oxide process. If you have a sizeable amount they might reprocess them for you. I have tried using naval jelly rust inhibitor which will turn bare steel to a matt black finish. I applied some to my antique tractor splined axle about 10 years ago and it still hasn't rusted.