How Do I Get the 'Cement' Off this Old Mystery Coin?

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detectorman5050
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How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by detectorman5050 » Fri Apr 20, 2018 10:55 pm

I found this old coin today, and caught my attention, as the rim is thicker than the normal coins I find from the Victorian/Modern age.

I also think it could possibly be silver, as it was higher up the conductivity scale than other coins. It's 20mm in diameter.

Sadly, many coins found around here look like someone has plastered 'cement' on both sides. Is it possible to get rid of this crud?

Thanks in advance.
old coin.png
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Easylife » Fri Apr 20, 2018 11:10 pm

Cement? Looks just like a knackered farthing. x; :D
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Mud Max » Fri Apr 20, 2018 11:14 pm

From my own experience, it's highly unlikely that a silver would go like this. It looks like rust so it could be a coin with an iron content. It sounds harsh but you could tap it with a hammer to loosen that much crud, or electrolysis may be the answer.

Either way it's unlikely that you will get much off that I'm afraid, in my opinion. Best of luck though.
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Easylife » Fri Apr 20, 2018 11:17 pm

Mud Max wrote:
Fri Apr 20, 2018 11:14 pm
It looks like rust so it could be a coin with an iron content.
Or a damp coin drying? :D
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by detectorman5050 » Fri Apr 20, 2018 11:21 pm

Mud Max wrote:
Fri Apr 20, 2018 11:14 pm
From my own experience, it's highly unlikely that a silver would go like this. It looks like rust so it could be a coin with an iron content. It sounds harsh but you could tap it with a hammer to loosen that much crud, or electrolysis may be the answer.

Either way it's unlikely that you will get much off that I'm afraid, in my opinion. Best of luck though.
I think you are correct in assuming it's not silver.

I reckon it's probably a George III farthing, based on diameter and the thickness of the rim.

Shame it's knackered, around here that would be a pretty good find, if it was in decent condition!
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Easylife » Fri Apr 20, 2018 11:29 pm

detectorman5050 wrote:
Fri Apr 20, 2018 11:21 pm
Mud Max wrote:
Fri Apr 20, 2018 11:14 pm
From my own experience, it's highly unlikely that a silver would go like this. It looks like rust so it could be a coin with an iron content. It sounds harsh but you could tap it with a hammer to loosen that much crud, or electrolysis may be the answer.

Either way it's unlikely that you will get much off that I'm afraid, in my opinion. Best of luck though.
I think you are correct in assuming it's not silver.

I reckon it's probably a George III farthing, based on diameter and the thickness of the rim.

Shame it's knackered, around here that would be a pretty good find, if it was in decent condition!
It seems to be mainly down to the metal quality at the time.
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by detectorman5050 » Fri Apr 20, 2018 11:43 pm

Easylife wrote:
Fri Apr 20, 2018 11:29 pm
detectorman5050 wrote:
Fri Apr 20, 2018 11:21 pm
Mud Max wrote:
Fri Apr 20, 2018 11:14 pm
From my own experience, it's highly unlikely that a silver would go like this. It looks like rust so it could be a coin with an iron content. It sounds harsh but you could tap it with a hammer to loosen that much crud, or electrolysis may be the answer.

Either way it's unlikely that you will get much off that I'm afraid, in my opinion. Best of luck though.
I think you are correct in assuming it's not silver.

I reckon it's probably a George III farthing, based on diameter and the thickness of the rim.

Shame it's knackered, around here that would be a pretty good find, if it was in decent condition!
It seems to be mainly down to the metal quality at the time.
Even early 20th Century coins from the fields around here are often a total mess - the majority are 'crusty.'
Last edited by detectorman5050 on Fri Apr 20, 2018 11:52 pm, edited 1 time in total.
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Easylife » Fri Apr 20, 2018 11:50 pm

detectorman5050 wrote:
Fri Apr 20, 2018 11:43 pm
Easylife wrote:
Fri Apr 20, 2018 11:29 pm
detectorman5050 wrote:
Fri Apr 20, 2018 11:21 pm


I think you are correct in assuming it's not silver.

I reckon it's probably a George III farthing, based on diameter and the thickness of the rim.

Shame it's knackered, around here that would be a pretty good find, if it was in decent condition!
It seems to be mainly down to the metal quality at the time.
Even early 20th Century coins from the fields are often a total mess - the majority are 'crusty.'
Yep, how they survive depends on the soil type, chemicals used and animal urine. I find sandy soils to be generally less harsh though. I think my oldest reasonable farthing is a William IV. ::g
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Dom » Sat Apr 21, 2018 5:55 am

I used an ultra sonic cleaner on what I thought was a coin just like yours. It was an amazing transformation, turned out to be a copper fairground token. The cleaner made it very bright and coppery, so I rubbed some van dyke solution into the details and it looked old again.
Would only use it on nothing to lose items though.
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by fred » Sat Apr 21, 2018 6:14 am

Dom wrote:
Sat Apr 21, 2018 5:55 am
I used an ultra sonic cleaner on what I thought was a coin just like yours. It was an amazing transformation, turned out to be a copper fairground token. The cleaner made it very bright and coppery, so I rubbed some van dyke solution into the details and it looked old again.
Would only use it on nothing to lose items though.
I agree, it's a good one to start practicing conservation on. ::g Doesn't really matter what as you are unlikely to make it much worse. :D
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Koala » Sat Apr 21, 2018 11:49 am

If it doesn't stick to a magnet.

Corroded pre decimal copper coins I soak in caustic. Yes it turns the patina black but they are ruined anyhow. Wash in water. Dry, most of it then comes off with your thumb nail. Please be careful caustic is corrosive.

Doesn't happen too often. But sometimes under the big lump the coins not too bad.


Not a good example as it's in poor condition and a boring George V but here is one I did earlier as they use to say on Blue Peter

viewtopic.php?f=120&t=100454

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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by targets » Sat Apr 21, 2018 12:59 pm

cookit on the gas stove and dunk in oil or water to remove crud
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Mancave-man » Mon Apr 23, 2018 4:01 pm

Don't write it off completely. I have had Roman Denari that looked similar which then were transformed using a touch of electrolysis. Can't harm it to try. Good luck if you do.

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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Oxgirl36 » Mon Feb 11, 2019 5:22 pm

targets wrote:
Sat Apr 21, 2018 12:59 pm
cookit on the gas stove and dunk in oil or water to remove crud
I tried this on an encrusted jetton at the weekend. It worked an absolute treat. It got most of it off with out damaging the coin or the patina. There is still a fine layer of deposit left in places but considering how heavily encrusted it was I was very impressed.

Heat using the flame from a gas ring. Drop in water or oil. Take out and rub between kitchen roll or similar then gently brush under water.

Repeat until happy.
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by JBM » Mon Feb 11, 2019 6:24 pm

Place it in a tumbler. ::g

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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Slapster » Mon Feb 11, 2019 10:13 pm

Dom wrote:
Sat Apr 21, 2018 5:55 am
I used an ultra sonic cleaner on what I thought was a coin just like yours. It was an amazing transformation, turned out to be a copper fairground token. The cleaner made it very bright and coppery, so I rubbed some van dyke solution into the details and it looked old again.
Would only use it on nothing to lose items though.
Out of interest, what Ultra Sonic cleaner do you use? And are they a good thing? Seems they start around £30, which to my reckoning is worth a punt. The bigger, more professional units seem to have a zero on the end of that, so a bit beyond it for me.....
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Re: How Do I Get the 'Cement' Off this Old Mystery Coin?

Post by Oxgirl36 » Mon Feb 11, 2019 10:17 pm

Slapster wrote:
Mon Feb 11, 2019 10:13 pm
Dom wrote:
Sat Apr 21, 2018 5:55 am
I used an ultra sonic cleaner on what I thought was a coin just like yours. It was an amazing transformation, turned out to be a copper fairground token. The cleaner made it very bright and coppery, so I rubbed some van dyke solution into the details and it looked old again.
Would only use it on nothing to lose items though.
Out of interest, what Ultra Sonic cleaner do you use? And are they a good thing? Seems they start around £30, which to my reckoning is worth a punt. The bigger, more professional units seem to have a zero on the end of that, so a bit beyond it for me.....
I think this might answer your question viewtopic.php?f=122&t=101391 ::g
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