On 06/04/2012 06:39 AM, gene heskett wrote: > On Monday, June 04, 2012 06:31:34 AM Mark Wendt did opine: > > >> On 06/03/2012 11:39 AM, gene heskett wrote: >> >> <snippage> >> >> >>> As for the various methods of blackening brass, discussed here >>> previously, most were butt ugly, giving all the colors of a good skin >>> bruise rather than a nice flat black. I believe that was because of >>> my inability to get all the cutting oil washed back out of the brass >>> with clean acetone or boiling in dish soap. I can't go enough >>> narrower to fix it with a 1/32" mill as I can't trim the slot width >>> more than another thou, so today I will try dimming the leds. There >>> has to be a fix someplace, I just have to find it... >>> >>> >>> Cheers, Gene >>> >> Gene, >> >> Acetone is a lousy degreaser. >> > I didn't know that. > > It cuts most anything else, so I figured it was good for oils too. > Yup, and acetone tends to leave an oily film on the surface. > >> Scrub with Dawn dish detergent and hot >> water, the follow that with a rubdown of denatured alcohol and a clean, >> oil free rag. Coffee filters or paper towels work good for that. >> > I used some sort of dish detergent, probably liquid Palmolive, whatever was > on the sink at the time. For the alky I use the paint thinner, real stuff, > no water in it like is in isopropol. > Dawn is a much better degreaser. Fella talked me into using it a few years back to wash down the surface of my cane rods before varnishing, and it worked great. I started using it on the metal stuff I was bluing and got more consistent blues of the metal too. And I always have a gallon of DNA laying around, for finishing and cleaning stuff. DNA is great for cleaning up soldering flux residue too. > >> That's all I do when I turn nickel silver fly rod ferrules, and I use >> cutting oil when turning them. I black/blue them without any trouble >> after that type of cleaning. Make sure you don't touch the brass with >> your bare hands after cleaning/degreasing, because skin oils will cause >> problems too. >> > Well known. White cotton gloves that get tossed in the washing machine > frequently, then kept in a quart ziploc bag till used. > Good deal. Work with the first two, and you should be able to get decent bluing/blackening on brass. > > >> Mark >> > Cheers, Gene > Cheers, Mark
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