[meteorite-list] R: R: iron meteorite natural color

From: John Lutzon <jl_at_meteoritecentral.com>
Date: Mon, 28 Nov 2016 13:01:36 -0500
Message-ID: <2B81087FD470404EB224E4851741AB61_at_Home>

Francesco,

This may be a longshot and/or may not be feasable...

It's called "fume bluing"....used for bluing/blackening firearms:

Clean to bare metal and de-grease--Then (basically) use a couple of
eyedropper amounts of a mixture of nitric acid and hydrocloric acid
(you must add one acid to the other in the proper order !!)
to the bottom of a plastic container that is big enough for the meteorite
to be suspended by metal wire and close the box. Prepare wire
harness beforehand. Leave for several hours until meteorite developes
a coating of rust "fuzz". Then, place meteorite into boiling water---
the rust coating will Turn Black. Then lightly brush/buff. This method
has been used for Many years by gunsmiths to achive a dark blue
to black finish on guns and is very protecting to the underlying metal.

You should be able to obtain a pre-mixed soution from a jewelry testing
supply co.. The little bottle you want is the one for testing 22K gold.
Just looked and it was going for $1.99 for 1/2 ounce. This may be all
you'll need--but i'd get two/ three.

Obviously, everyone is cringing on the thought of boiling a meteorite----
but wouldn't lightly oven heating for awhile remove the interior moisture?

I'm interested myself for comments on this approach or anyone who
may have personal knowledge using this method.

Regards, John




----- Original Message -----
From: "Francesco Moser via Meteorite-list" <meteorite-list at meteoritecentral.com>
To: "'Marcin Cimala - POLANDMET'" <marcin at polandmet.com>
Cc: <Meteorite-list at meteoritecentral.com>
Sent: Monday, November 28, 2016 10:00 AM
Subject: [meteorite-list] R: R: iron meteorite natural color


I think I was misunderstood due to my poor English.
I don't want to put paint on the meteorite, absolutely no!
And I don't want to replicate a false Sikhote looking.
As well I don't want to have a silver looking meteorite.

This is what I want:
http://www.polandmet.com/_morasko/003.htm
Nude black iron!!!

All the Campo I found on the market have this type of "black" surface:
I want to remove rust and obtain this surface finishing:
http://www.katiepaterson.org/meteorite/katie_paterson_meteorite_giorgia_poli
zzi_120711_6695.jpg

So .. how can I deeply remove rust and preserve nude black iron surface?
I'm planning to use sand blasting for remove the rust, but with this process
I will obtain a "nude grey iron"
It's possible to convert nude grey to nude black? Without using oil or waxes
and of course no paint?
Or it's better to use a different process for remove rust? Which process?

For example: how you clean your Morasko for reach that black surface?
Electrolytic bath? I can also use on Campo?

Thanks!



<x>x<x>x<x>
Francesco


-----Messaggio originale-----
Da: Meteorite-list [mailto:meteorite-list-bounces at meteoritecentral.com] Per
conto di Marcin Cimala - POLANDMET via Meteorite-list
Inviato: luned? 28 novembre 2016 02:43
A: Francesco Moser <cojack at tiscali.it>; Meteorite-list at meteoritecentral.com
Oggetto: Re: [meteorite-list] R: iron meteorite natural color

Hey
Well its difficult becouse when You remove rust completly You will get a
silver "something", yes ? Something that not look like meteorite. But adding
crusty-like fake layer to look Your crusty-less Campo like Sikhote its also
false way.
Campo is not the best one to sandblast becouse there is nothing on the
surface. No inclusions or rarely anything. I have tryed once and I didnt
like it. I let it rust again get a better color LOL

Maybe if You post photos of Your specimen I can have a better idea what You
have

-----[ MARCIN CIMALA ]----[ +48 793567667 ]-----
http://www.Meteoryty.pl marcin(at)meteoryty.pl
http://www.PolandMET.com marcin(at)polandmet.com
--------[ Member of Polish Meteoritical Society ]--------






Marcin and Doug!
Thanks for your replys!

Ok, I understand what you mean about the authenticity of color.
For sure the desert varnish of some iron meteorite like Gibeon or Henbury is
the most natural looking for a find (not fall) meteorite.
But old and buried meteorite like Muonionalusta or Campo have a very thick
rust and oxide crust, I suppose no one want to have that on his irons.
So after remove and clean all the rust shale what remains? Grey nude iron
... it is absolutely not natural!!!
So for me on this type of meteorite the black surface is something better
that the nude iron, isn't?
Of course I don't want to paint the meteorite, just convert the nude grey
iron to dark.
How it is possible? With oil?

All the Campo that are on the market have nude dark iron on the surface, how
can I reach the same looking starting from nude grey iron results of sand
blasting?

Thanks


Ciao

<x>x<x>x<x>
Francesco


-----Messaggio originale-----
Da: Meteorite-list [mailto:meteorite-list-bounces at meteoritecentral.com] Per
conto di Marcin Cimala - POLANDMET via Meteorite-list
Inviato: gioved? 24 novembre 2016 23:42
A: Meteorite-list at meteoritecentral.com
Oggetto: Re: [meteorite-list] iron meteorite natural color

> Hello,
> I have a question.
> As we know an iron meteorite, such like Campo del Cielo for example,
> have a black surface.
> I have here a deeply rusted Campo, I'm planning to remove rust with a
> sand blasting process.
> But with this I will obtain a greysh surface, like naked iron, the
> same color of a slice.
> Not really a natural color for the exterior of an iron meteorite and
> also not aestetically pretty, looks too artificial for me.
> There is something to do for restore the original black color?
> Or it's better to remove the rust with a traditional steel brush,
> maybe with a drill ???
>
> Tips for mechanical or chemical process are welkomme!!!
> I can try with the classical NaOh bath, I have also Phosphoric, Citric
> and Oxalic acid :)
>
> Thanks
> <x>x<x>x<x>
> Francesco

Hah good question Francesco. But what is natural color of meteorite at all ?

Desert sandblasted NWA is not a real looking meteorite? Should I paint them
black to be looking like a real meteorites ? Poor Dhofars....
This is what Im fighting long time. Strange stereotype that meteorite MUST
BE BLACK outside, WHY ?

When You like Your girlfrend ? When he smile to You with his pretty face or
when she put ton of Max Factor chemicals on it??

I have always strange taste, different than most of collectors. For me, if
specimen have crust must be black or black with rusty patina. If meteorite
have no more crust like Campo, why to "paint" it to black to looks like
Sikhote ? Then You will see paint, not Your meteorite. I only can imagine
what strange things they do to clean Campo and look it like that. LOL

OK now a few tips.
As I understand Your Campo is a complete specimen ? To remove deep rust You
must use electrochemical cleaning + brush + small hammer. Then You will get
mostly cleaned meteorite with BLACK remains of rust that will make Your
meteorite looks REAL.Then heat it and put alot of oil to make it looks fresh
and oriented :)

-----[ MARCIN CIMALA ]----[ +48 793567667 ]-----
http://www.Meteoryty.pl marcin(at)meteoryty.pl
http://www.PolandMET.com marcin(at)polandmet.com
--------[ Member of Polish Meteoritical Society ]--------



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Received on Mon 28 Nov 2016 01:01:36 PM PST