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"Proper" Acetone Use

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Dagaz's Avatar
Slovenia
459 Posts
 Posted 10/13/2015  03:47 am  Show Profile   Bookmark this reply Add Dagaz to your friends list Get a Link to this Reply
I don't want to open a new topic for this... Among some old junk at home, my mom found a silver 50 shilling Austrian 1974 Commemorative coin. While nice, it has a lot of green spots (I think because of the storage in some plastic wrap). What are those green spots and is it OK to try acetone on this? I will experiment a bit on non-value coins of course :)
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BadThad's Avatar
United States
19969 Posts
 Posted 10/13/2015  11:21 am  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply

Quote:
While nice, it has a lot of green spots


Post some pictures for us. There are 3 possibilities:

1) PVC residue - easily removed with acetone.
2) Other organic residue - removed with water, acetone and/or xylene.
3) Verdigris - Can be conserved, results depend on severity.
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Dagaz's Avatar
Slovenia
459 Posts
 Posted 10/14/2015  07:52 am  Show Profile   Bookmark this reply Add Dagaz to your friends list Get a Link to this Reply
Will post tomorrow, I'm away from my collection today.
But I think its No. 1., because it was stored in some hard plastic folder for more than 30 years and as my mom told me, she hasn't ever took the coin out.
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Chute72's Avatar
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 Posted 10/14/2015  09:03 am  Show Profile   Bookmark this reply Add Chute72 to your friends list Get a Link to this Reply

Quote:
Yes there will always be stories about how great someone did with a quill, toothpick, etc. However, those may be just stories. Remember not everything you read on the internet is for REAL.

I agree 100%. Not just coins, but news, conspiracies and Big Foot. Always include photos of your work.
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 Posted 10/14/2015  09:09 am  Show Profile   Bookmark this reply Add teo2015 to your friends list Get a Link to this Reply
Like how the before and after cleaning even changed the date. is cleaning what causes 44D pennies to become 14Ds?
Edited by teo2015
10/14/2015 09:29 am
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 Posted 10/14/2015  10:10 am  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
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Earle42's Avatar
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10047 Posts
 Posted 10/18/2015  9:30 pm  Show Profile   Bookmark this reply Add Earle42 to your friends list Get a Link to this Reply
How lint to soak?
I put the coin in acetone, take out a blank 2X2, write the info I want on the 2X2, get the coin out of the soak onto a clean, cotton cloth (T-shirt), examine the coin under magnification to see if the gunk I waned gone is no longer there, use a squeeze bulb to blast any dust off of the surfaces of the 2X2, insert coin and staple.

If the coin did not pass the magnification test I may try for a couple minutes. If this does not work, then its time for the microscope and porcupine quill.


Quote:
Yes there will always be stories about how great someone did with a quill, toothpick, etc. However, those may be just stories. Remember not everything you read on the internet is for REAL.


Yup - the quill is a real story. The "ouch" end is finer than a toothpick and seems to be more soft. A microscope lets you see the large difference in the ends your eye cannot.

If you get a really skinny quill (yes - different sizes depending on where the animal grew them on itself), the tip is actually small enough to fit inside the holes of mint marks. A very (cannot emphasize this enough) scoop/push dislodges the gunk filling the hole.

So carry a pair of leather gloves with you. Next time you see a dead porky, get the gloves and fill up. Remember to look for the long thin ones.

One quill has lasted me hundreds of coins - literally. Like the toothpick, I have seen a piece of dirt stick to the end and scratch the coin on a micro level. But with such a small tip as compared to a toothpick, this does not happen as often.
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Edited by Earle42
10/18/2015 9:41 pm
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Dagaz's Avatar
Slovenia
459 Posts
 Posted 10/20/2015  01:12 am  Show Profile   Bookmark this reply Add Dagaz to your friends list Get a Link to this Reply
Finally took time to photo that mentioned 50 schilling coin for possible acetone bath.
Here it is





What do you guys think?
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Chute72's Avatar
United States
1314 Posts
 Posted 10/20/2015  05:07 am  Show Profile   Bookmark this reply Add Chute72 to your friends list Get a Link to this Reply
It may not fix the problem, but I would dunk immediately in acetone. Then photograph again.
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BadThad's Avatar
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 Posted 10/20/2015  2:23 pm  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply

Quote:
Finally took time to photo that mentioned 50 schilling coin for possible acetone bath.


What is the composition? Acetone won't hurt, I'd do it to make sure that's not PVC residue but some of the spots look like common verdigris.
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hozer's Avatar
United States
422 Posts
 Posted 10/28/2015  10:29 pm  Show Profile   Bookmark this reply Add hozer to your friends list Get a Link to this Reply
Eventually the Acetone will evaporate. I had a clad colorized quarter and soaked it in Acetone over night, the colorization was rolled up and free from the coin and the container was dry. No visible damage to the coin at all.
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