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Old 03-24-2018, 02:35 PM
Parkerized Parkerized is offline
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Join Date: May 2006
Posts: 5
Default Sand concretion from brass/bronze

Anybody have a good, safe way to get sand concretion off of a brass or bronze button?
I tried a toothbrush and toothpicks to no avail.
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Old 04-26-2018, 10:01 PM
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NMsilver NMsilver is offline
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Join Date: Aug 2011
Location: New Mexico
Posts: 485

I did this a couple days ago with a sand-concreted penny- heat with a blowtorch then drop into a jar of ice water, repeat several times.

The first run, I heated it so much it made a cracking noise and about a third of the crust came flying off. a couple more runs broke most of the rest off.

Once the surface is exposed, too much blast from the torch will corrode the surface quickly and even melt fine details, so be careful.

I wouldn't do this with a valuable find though.

Tesoro Vaquero, AT Gold, ML Safari, Propointer
Oldest (dated) coin:1624 2 Kreutzer (German)

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