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#1

Daggy
Member
Joined: 18 December 2016
Posts: 194
Member
12 February 2018 10:52 am

G'day everyone

Just thought I'd share the results of many hours experimenting with different methods of cleaning old copper coins. After coming to the conclusion that boiling them in motor oil worked best, I still wasn't happy.

I found my oldest coin to date on Saturday at a racecourse not far from Bundy, that was built in the late 1800's. The coin is an 1866 penny.
I was impressed with the results that others have had with "Andre's pencils" and started scraping away with a bamboo kebab stick. To cut a long story short, I ended up with a piece of kebab stick in my dremel (due to my impatience).

Here's the results.1518392668_1866-optimized.jpg1518392692_1866r-optimized.jpg

Here's a few more I did plus one that I left half untouched for comparison.
1518392915_roo-optimized.jpg1518392934_pen-optimized.jpg1518392949_test-optimized.jpg
And the dremel.1518392991_drem-optimized.jpg

Thanks for looking.
Darren


X-Terra 705, Go-find 40, Bounty hunter tkr iv and a fishing rod.

6 users like this post: LORD, SinHof, silver, TonyynoT, Tribsa 56, 7.62marksman

#2

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 3,110
Member
14 February 2018 10:42 pm

Hi Daggy. Not the best photo but here's some I put in my tumbler with stainless steel shot.
Came up ok I reckon but definitely not something to do with anything that may be valuable.
1518608187_15186081371340.jpg
The row of 3 x pennies on the left are a sample of the type/condition coins I put in & the 4x on the right are after about 2hrs in the tumbler. The far right one had some pretty bad green copper cancer on it but it came off ok. Left a few dark marks but heaps better than before - maybe a bit longer for those ones?


Everything we use comes from mining or farming.

2 users like this post: Danny13, Daggy

#3

Daggy
Member
Joined: 18 December 2016
Posts: 194
Member
15 February 2018 07:10 am

G'day Mbasko

I've been thinking about buying a tumbler for a while now, mainly for rocks but I recon it would clean all my spendables pretty well.
Does the steel shot do any damage to the lettering on the coppers?

Daggy


X-Terra 705, Go-find 40, Bounty hunter tkr iv and a fishing rod.

#4

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 3,110
Member
15 February 2018 08:24 am

Nothing noticeable. I wouldn't recommend leaving them in for any more than a couple of hours though. Some say to check them every 20mins or so?
Would be great on the modern coins to clean up.
I got my tumbler for rocks & only recently got the stainless shot to try on metals. Happy with the results so far. Might try a dirty nugget in there to & see how it cleans up?
Have had some potch in one tumbler lately & some of it is now showing colour where I didn't see any before. Did some agate & petrified wood from the Ridge that came up nice too.


Everything we use comes from mining or farming.

2 users like this post: NeilM, Daggy

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