[meteorite-list] Patina
From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Fri May 12 12:43:52 2006 Message-ID: <4464832E.11172.12B5D62_at_localhost> Hi Walter, I used a wre brush on a rotary tool [Full sized variable speed drill - lol] I thought it worked out pretty good. Thank you. Gary On 12 May 2006 at 11:32, Walter Branch wrote: > Hi Gary, > > Nice clean up job. Did you use any chemicals or just the wire brush. > > I recently got one of Bill Mason's meteorite rust removal kit and I have > been experimenting with it. > > -Walter Branch > ----------------------------------------------------- > ----- Original Message ----- > From: "Gary K. Foote" <gary_at_webbers.com> > To: <MexicoDoug_at_aol.com> > Cc: <Meteorite-list_at_meteoritecentral.com> > Sent: Friday, May 12, 2006 10:25 AM > Subject: Re: [meteorite-list] Patina > > > > Thanks Doug, for your thoughtful analysis. I had a piece of campo with an > unusual shape > > that came to me rusty and not looking like it was going to stop rusting. > I took a wire > > brush to it and removed the rust and now have a specimen that still shows > flight details > > and has nearly no rust. The only drawback is that I had to expose the > high spots right > > down to shiny metal to get the rust out of the low spots. I'm sure I lost > some material, > > but think it was minimal. > > > > I've seen pallasites chopped up into medallions and such on ebay and think > that kind of > > manipulation is over the line, but I believe that what I have done makes > the specimen > > more 'enjoyable' to view. If you would like to see pics of before and > after the links > > are below; > > > > Before: http://www.meteorite-dealers.com/images/campo-the-hand-600.jpg > > > > After: http://www.meteorite-dealers.com/images/campohand-wirebrushed.jpg > > > > Gary > > > > On 12 May 2006 at 9:47, MexicoDoug_at_aol.com wrote: > > > > > Gary F. writes: > > > > > > <<Which is best value wise? Original condition with dirt and natural > patina > > > or cleaned > > > with patina left or cleaned and polished free of patina?>> > > > > > > Gary, > > > Patina...if patina is an arrested natural finish, sounds awesome to me. > > > > > > There is "cleaned", and then there is "cleaned" just as there are stones > and > > > there are irons, and "scientific value" and "sentimental value" and > "trade-in > > > value". Never clean stones with solvents. Distilled water and reagent > grade > > > alcohol are in a questionable category here and questionable equates to > not > > > necessary. If the dirt comes off with your hands (and not a wire brush > by > > > wearing down the surface of the stone or iron, of course it is > recommendable to not > > > have such dirty meteorites in your collection - they will make > everything > > > dirty wherever you put them.) The one exception to the solvent rule is > the > > > ultimate form of cleaning - hacking off slices. To make a cut, you will > need a > > > friendly solvent - but you aren't asking about cutting. > > > > > > If you have a stable iron, the same applies. In economics there is a > value > > > to an option. Give the next guy a chance with the option "to clean or > not to > > > clean, and that is the question". If you choose to clean it, you will > > > eliminate some of the demand because you have killed that option for > those who want a > > > natural meteorite. Less demand = less value both scientifically and one > would expect > > > monetarily. Same goes for whether you should cut a nice looking whole > individual - don't. > > > > > > If you don't have a stable iron, you don't have much choice in the > matter. > > > Either you find an acceptable way to clean it or you will be left with a > pile > > > of junk. Pile of junk futures are not very scientifically or > commercially > > > valuable, though in this field there are suckers born every minute to > keep such > > > futures alive. The iron is rented anyway as it is a matter of time... > So brush > > > it with a stainless brush, boil it in parrafin, strip it, coat it in PU, > > > pickle it a bit and then saponify it in caustic soda, vacuum pack it in > beef jerky > > > factory, sell it on ebay, whatever your heart enjoys. Have as much fun > as I > > > do when you are handed a sledgehammer at a carnival to smash a useless > car, or > > > as a shifty used car dealer who fixes up an old jalopy enough to have > his > > > hapless* customer drive it out the door...If it is a rare iron, though, > better yet > > > leave it alone and trade or give it to a museum so they can evaluate how > to > > > best preserve it for humanity, unless you realistically believe you can > do a > > > better job or have Bill Mason on your staff. > > > > > > *cool word, borrowed from a recent post > > > > > > Hope this helps. As you can see I am of the strict don't clean anything > > > unless it is absolutely necessary belief. But then you have the irons > that are > > > borderline. For them, you want the natural naughty Squirrel Nutkin > finish-and > > > not sandblasted down to the patina and beyond- if an arrested natural > nutshell > > > exists. But if it doesn't (because one didn't develop, or because the > soil > > > was part of it and now the soil is removed), a good wire brushing may be > in > > > order though you will lose some weight, you will minimize the surface > area for > > > absorption of water and buildup of other catalytic corrosives... > > > > > > Saludos > > > > > > > > ______________________________________________ > > Meteorite-list mailing list > > Meteorite-list_at_meteoritecentral.com > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > Received on Fri 12 May 2006 12:44:30 PM PDT |
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