[Colonial Numismatics] Cleaning Coppers that are BLACK 上市 Deposited
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- From njraywms@optonline.net Thu Feb 27 08:37:59 2003
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Date: Thu, 27 Feb 2003 11:41:21 -0500
Subject: Re: [Colonial Numismatics] Cleaning Coppers that are BLACK
To: colonial-coins@yahoogroups.com
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From: Ray Williams <njraywms@optonline.net>
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Are there any dentists out there? I've always wondered if the pater pic
that shoots high pressure water for cleaning plaque from teeth, would work
on removing corrosion from a coin (verdigris too).
Ray W
----- Original Message -----
From: <jlorenzo@ob.ilww.com>
To: <colonial-coins@yahoogroups.com>
Sent: Thursday, February 27, 2003 11:32 AM
Subject: [Colonial Numismatics] Cleaning Coppers that are BLACK
> The best way to clean coppers is not to clean coppers. However, if
> you "must" and since there is some truth that corrosion areas can
> become worse particularly if the coin is not stored correctly then
> some form of cleaning makes sense. I would use a neutral type
> cleaner. Neutral being neither a water or solvent-base alkaline or
> acidic material but a solvent with no additives.
> Solvents such as freon I found worked the best with a Q-tip not
> leaving any post discoloration. Freon is tough to get due to the
> ozone issue. It was one solvent I found that did not discolor the
> copper-At ALL. However, today try an alcohol such isopropanol or a
> ketone such as acetone. A black copper is however something different
> than a dirty brown copper. A solvent will remove light loose dirt and
> surficial particles and for this type of black patina - I would
> proceed with this solvent step in removing the surficial soils and
> leave the black color. The only thing worse than a black coin is a
> discolored coin with black remnants in all of the motifs. Black
> patina coppers are around and is not that much of a deterrent on its
> price unless surficial corrosion is present with this off-patina.
>
> JPL.
>
>
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> - 2003-02-27
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