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Offline CyberborikuaTopic starter
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« on: April 09, 2011, 09:07:41 pm »
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Today I found this 1917 Mercury Dime that seems to have been submerged in a lake or a river for many years and got a heavy coat of green algae that eventually dried out. There was a small park lake in the past where I found it. Does anyone have an idea on how to remove the algae coat? I can't even see the minmark on the back, if it has one.

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Offline seldom
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« Reply #1 on: April 09, 2011, 09:28:57 pm »
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electrolysis there is a thread here about it.

Posted on: April 09, 2011, 09:27:23 PM
Here is a thread that Pgill started good info.

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Offline TriDitty
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« Reply #2 on: April 14, 2011, 09:46:32 pm »
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Mercs kick butt!!!!!  I love those coins but have only found a few.  I hope yours cleans up well.

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Offline CyberborikuaTopic starter
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« Reply #3 on: April 14, 2011, 09:57:58 pm »
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That is my 4th and the oldest so far. I was told to clean it with electrolysis, but not sure the green stuff is corrosion. I think the coat is just dried green algae from being in a lake for many years.

Hey, I saw the silver bar you found. Very nice job man!

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Offline GoldDigger1950
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« Reply #4 on: April 15, 2011, 03:22:38 am »
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Quote:Posted by Cyberborikua
That is my 4th and the oldest so far. I was told to clean it with electrolysis, but not sure the green stuff is corrosion. I think the coat is just dried green algae from being in a lake for many years.

If that's true, look for an acid that will not harm silver but will attack vegetation. Vinegar (weak ascetic acid) or carbolic acid (soda water) both come to mind as agents for this.

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Offline CyberborikuaTopic starter
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« Reply #5 on: April 15, 2011, 06:28:57 am »
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Quote:Posted by GoldDigger1950
If that's true, look for an acid that will not harm silver but will attack vegetation. Vinegar (weak ascetic acid) or carbolic acid (soda water) both come to mind as agents for this.


I have thought about vinegar or pure lemon juice, but I must be certain about the source of the green coat. I'll undust my microscope this weekend and take a look at the coin. If it is algae, as I suspect, I'll try a weak acid on it. Thanks GD!  Wink

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« Reply #6 on: April 15, 2011, 07:19:55 am »
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I've done the lemon juice thing and my silver coins come out pink??

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Offline TriDitty
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« Reply #7 on: April 15, 2011, 08:27:12 am »
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I bought a microscope less than a year ago and love it.  I got it for checking out stool samples of my dogs since I have been breeding a couple of pairs.  Bugs like coccidia (sp?)s are easy to spot after a little experience.  Worm eggs are easy to spot as well and it does not make sense for me to pay for vet visits due to simple issues.



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Len
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Offline Mudflap
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« Reply #8 on: April 15, 2011, 08:33:40 am »
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I start with a paste of baking soda and water. Put in the palm of one hand and rub the coin gently with your finger. Silver will clean up real nice. Note>> it will take off any "antique patina".

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Offline CyberborikuaTopic starter
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« Reply #9 on: April 15, 2011, 11:12:43 am »
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Oh that's not good. Thanks for the tip!

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