Hi Pete and list, interesting read this one, just an untried thought after
years of cleaning ancient coins now and then, the caliche is a carbonate, I
am assuming, it should dissolve rapidly in HCl or Hydrochloric acid, dilute
to slow it. Also, I had success on certain coins removing bad stuff by
heating and quenching in water, SSSSSSS and it flaked off.
Cheers, Kevin.
From: "Pete Pete" <[EMAIL PROTECTED]>
To: meteorite-list@meteoritecentral.com
Subject: [meteorite-list] Cleaning Scale off Stonys
Date: Mon, 02 Jan 2006 17:45:34 -0500
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Hello, List,
...so quiet in here...everyone still hung-over, eh?
A while ago I posted a request for any suggestions to make getting scale
off of stone meteorites any easier, without a response.
I tried a few things myself and I'll pass on the results for anyone who is
interested:
De-scalers like CLR or Limeaway are messy, smelly and potentially
dangerous, even in a diluted form down to 25% with distilled water - and it
changed the appearance of the surface somewhat.
A furnace humidifier "scale-be-gone" solution was the same disappointment.
Hydrogen Peroxide, however, was a definite help, and at the household 3%,
it's relatively safe.
I submerged the intended stone in the peroxide for about an hour, and while
keeping it wet I started cleaning.
It is still a meticulous task - I still needed to use the dental picks, but
the scale comes off a lot easier and in bigger chips, and doesn't appear to
harm the meteorite.
I soak the stones in alcohol when I'm done to displace the water.
I'll try 10% later, and if there's an marked advange I'll post the
results...unless someone else tries it first...
I suggest you wear disposable gloves, though, as the stuff will bleach your
fingertips.
Any input or further suggestions would be appreciated.
Cheers,
Pete
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