Restoring the patina on an over cleaned bronze coin?

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Ollie-C
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Restoring the patina on an over cleaned bronze coin?

Post by Ollie-C » Thu Apr 16, 2015 5:07 pm

I found my best bronze coin 4 months into the hobby but I didn't realise it at the time and stupidly over cleaned it stripping off all of the original patina, I have learnt my lesson! rl; ;;z

Is there anyway I can restore the look of the original patina without purchasing any funky chemicals etc? I'd like to achieve a black/brown finish ideally, similar to how it came out of the ground. I currently have it in olive oil, but I'm not sure that will work? Pics of said coin (Celtic unit) are below.

Image

Image


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Re: Restoring the patina on an over cleaned bronze coin?

Post by Allectus » Thu Apr 16, 2015 5:17 pm

The tannin in tea is a powerful dye. ::g


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Re: Restoring the patina on an over cleaned bronze coin?

Post by Ollie-C » Thu Apr 16, 2015 5:21 pm

Allectus wrote:The tannin in tea is a powerful dye. ::g


A ;)
As evident inside a colleagues tea cup! :)) So, make a nice black brew and let it soak for a bit? Cheers ::g
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Re: Restoring the patina on an over cleaned bronze coin?

Post by Fusion » Thu Apr 16, 2015 5:33 pm

You could try the 'put it in the oven' method, as described in this thread:
http://www.metaldetectingforum.co.uk/vi ... 22&t=59653
:(

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Ten pence! » Thu Apr 16, 2015 10:09 pm

You can buy a product called Brass Black which is used in the gun trade for er... turning brass or copper black or alternatively you can get some household ammonia which is relatively inexpensive and either mix some with some sawdust to dampen it then seal it in a container for a day or so, or suspend the coin by wire in a glass with a small amount of ammonia in the bottom, (the fumes turn copper green)and seal the top with cling film.

Although in truth it's very hard to replicate what you've strip off.

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Danzigman » Thu Apr 16, 2015 10:24 pm

Meny for what you like to do in right side.. Tanning is a bit down - http://www.metaldetectingworld.com/clea ... coin.shtml" onclick="window.open(this.href);return false;
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Re: Restoring the patina on an over cleaned bronze coin?

Post by DAVYBFAST » Fri Apr 17, 2015 7:48 am

just washed my cup or I would have took a pic of the inside. lol

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Ravenrook » Fri Apr 17, 2015 9:05 am

Sounds like a complete minefield to me!!

Be very careful you don't make it worse!
I'd speak to a pro in a jewelers if I were you.


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Re: Restoring the patina on an over cleaned bronze coin?

Post by bbuster88 » Fri Apr 17, 2015 1:07 pm

Hi Ollie, found myself asking the same when I was over cleaning rl; tried : liver of soulful witch to be honest just stunk my kitchen out b;> didn't go down to well, then danzigman recommend JAX PETINA SOLUTION, I'll put the link for you, anyway works brilliantly, there's no smell & if you go for the 4 then you have the choice green/black/brown.... Works in around 20/30 seconds ::g

http://www.nobleromancoins.com/index.ph ... 1196ac243b" onclick="window.open(this.href);return false;

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Cobs » Fri Apr 17, 2015 1:46 pm

You could try reverse-electrolosis, im sure that would darken the metal instead but have a read up on that first, been a while since i used electrolosis, failing that you could seal it with black boot polish.
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Re: Restoring the patina on an over cleaned bronze coin?

Post by Ollie-C » Fri Apr 17, 2015 2:53 pm

Thanks for all the advice, lots of different ways of potentially doing it then! I've currently got it soaking in tea. I'll report back with my findings ::g I haven't got the patience to stick it back in the ground for 50-100 years :))
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Re: Restoring the patina on an over cleaned bronze coin?

Post by Ulvir » Sat Aug 15, 2015 9:39 pm

Put it in a dung heap for a while - works a treat..

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Ten pence! » Sat Aug 15, 2015 10:23 pm

Buy a bottle of ammonia at a hardware store (very cheap) and obtain some sawdust, put about three or four heaped table spoons of the sawdust in a cup and add a few drips of the ammonia until the sawdust is evenly damp, put the coin/relic in the cup and bury it in the sawdust, place some cling film over the top of the cup to prevent the fumes evaporating and within 24 hours your copper or brass item will have turned green!

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Re: Restoring the patina on an over cleaned bronze coin?

Post by bbuster88 » Fri Aug 28, 2015 9:50 pm

Hi I have the jax 4-pack for sale from us, without doubt the best for touching up or completely re-patination products and save a coin, link at bottom, :D

Without sounding a [email protected] just wash your coins with a bit of washing up liquid END OFF ! Really I've learnt my lesson :( pm me if interested buddy ::g

http://www.nobleromancoins.com/product_ ... ucts_id=49" onclick="window.open(this.href);return false;
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Re: Restoring the patina on an over cleaned bronze coin?

Post by targets » Sat Aug 29, 2015 4:13 pm

poke it in a cow pat and leave for 3 months in the garden
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Re: Restoring the patina on an over cleaned bronze coin?

Post by Danzigman » Sun Sep 27, 2015 10:48 pm

Any easy way to repatinate Silver coins.. Had one I overcleaned and like to make it more "original"
It was unreadable and thick covered isn sand and soil.. destiled water soak could do not notthing.. dishwater soap no working.. So gave it ½ hour in lemon while eating.. Arghh to much.. Any advise would be great.. Thank you..
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Re: Restoring the patina on an over cleaned bronze coin?

Post by redwulf500 » Sun Sep 27, 2015 10:55 pm

Hi get some liver of sulpur..... ::g

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Danzigman » Sun Sep 27, 2015 11:14 pm

redwulf500 wrote:Hi get some liver of sulpur..... ::g
Liver -like flesh/meat.. and the sulfur ?? Not sure I totally understand.. But thank you..
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Re: Restoring the patina on an over cleaned bronze coin?

Post by Fusion » Mon Sep 28, 2015 3:50 am

Sergei has some sulphur-related methods:
http://www.metaldetectingworld.com/clea ... hing.shtml
Google "Liver of Sulphur" for details, it's available commercially as a liquid.
There's also "boiled egg methods" (there's sulphur in the yolk). And reverse electrolysis (turns a coin black in seconds, use with care).
:(

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Re: Restoring the patina on an over cleaned bronze coin?

Post by redwulf500 » Mon Sep 28, 2015 8:38 am

have a look at this well known auction site ..131465190307

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Danzigman » Mon Sep 28, 2015 10:04 am

redwulf500 wrote:have a look at this well known auction site ..131465190307
OooO ::g Thank you..
Just now testing a mix of egg and Garlic and 2 hour in zip bag.. Let you know how it work..
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Re: Restoring the patina on an over cleaned bronze coin?

Post by JamieB » Mon Sep 28, 2015 1:54 pm

bbuster88 wrote:tried : liver of soulful witch
Sounds hard to come by!! =)) =))

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Danzigman » Mon Sep 28, 2015 6:50 pm

Danzigman wrote:
redwulf500 wrote:have a look at this well known auction site ..131465190307
OooO ::g Thank you..
Just now testing a mix of egg and Garlic and 2 hour in zip bag.. Let you know how it work..
Non or very little effect with the garlic and Egg.. 3 hours, and very hard to see it have changed. ;;z
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Re: Restoring the patina on an over cleaned bronze coin?

Post by redwulf500 » Mon Sep 28, 2015 6:57 pm

Hi the liver stuff works in seconds and if you overdo it clean and start again...

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Re: Restoring the patina on an over cleaned bronze coin?

Post by Biblins » Tue Sep 29, 2015 10:33 am

I tried the sawdust/ammonia trick on a 1960s halfpenny in a jar last night.

I now have the shiniest halfpenny I have ever seen! 8-}

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