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Getting the molds out of brass

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Nic
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Philippines
1154 Posts
 Posted 11/08/2009  11:02 pm Show Profile Bookmark this topic Add Nic to your friends list Get a Link to this Message

It's a 1945 Republica Peruana Brass coin, 5 centavos value, and 17.3mm diameter, I find interesting and would want to make it more presentable.

What method, by your experience, can clean or take out these molds? thanks!





Edited by Nic
11/08/2009 11:05 pm
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Canada
859 Posts
 Posted 11/09/2009  01:24 am  Show Profile Bookmark this reply Add D to your friends list Get a Link to this Reply
This topic was some where on another forum that I cannot place right now but here is the link from that forum. It is a very good site to learn different methods of coin cleaning.

http://metaldetectingworld.com/clea...n_coin.shtml
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United States
13211 Posts
 Posted 11/09/2009  03:46 am  Show Profile Check echizento's eBay Listings Bookmark this reply Add echizento to your friends list Get a Link to this Reply
Nic, here is a web site that will explain what is going on with that coin and how to correct it. http://www.classicalcoins.com/bronze_disease.html
New Member
Canada
8 Posts
 Posted 11/09/2009  2:57 pm  Show Profile Bookmark this reply Add purecopper to your friends list Get a Link to this Reply
Sometime letting in sit in a bit of vinegar for several hours takes the mold out of coins.
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 Posted 11/09/2009  6:51 pm  Show Profile Bookmark this reply Add just carl to your friends list Get a Link to this Reply

Some time ago I had some coins that were all messed up one way or another. The nickels were polished to a mirror like finish. The large cent was corroded, stained, potted with stuff like yours. One Lincoln, the 1919 also was covered with something. The Indian Head was really full of something green and black.
All were placed in the same glass jar for a while with Olive Oil. Eventually all were dumped in Laquer Thinner for a few days or more. Not sure. Then rinsed with Alcohol and placed in a clean jar of Acetone and left on a picnic table for a long time. Slowly water was added to this since there was a post about the dangers of water and Acetone and Copper coins. Eventually all were removed, allowed to dry, placed on the inside of a kitchen window sill for a long time and still there now.
Not all almost all the contaminations are gone. Although the Indian Head cent still has the black stuff on it. The Large Cent and the Indian Cent have both turned an actual RED and are still getting REDER. This is not the so called Cent Red people say, this is really RED. The 1919 Lincoln now is clear of whatever was on it but now really dark. LSQ really came out the best I think. Almost looks like a normal coin. Nickels lost that mirror look too.
Since these were all free, nothing to really loose.
I would suggest just experimenting if you don't mind people saying things like wow did someone claen this coin.
just carl
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Philippines
1154 Posts
 Posted 11/09/2009  8:19 pm  Show Profile Bookmark this reply Add Nic to your friends list Get a Link to this Reply
Thanks all, info much appreciated, d23 that is a great site! thank you for the link. just carl thanks for the pic, the 1845 coin still looks great!
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 Posted 11/09/2009  8:26 pm  Show Profile Bookmark this reply Add Nic to your friends list Get a Link to this Reply
echizento thanks for the web site link

Quote:
Bronze disease will not spread to other coins, unless an infected coin is in direct contact with them


I'll have to isolate this coin, and there's even a name for it! "Bronze disease" - dissolving copper from the outside going in and going out!

summarised procedure per the web site: brush mold off with nylon brush,toothpick off stubborn parts, rinse with distilled water and bake below 250F to get moisture out. Thanks -will do
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 Posted 11/12/2009  5:52 pm  Show Profile Bookmark this reply Add just carl to your friends list Get a Link to this Reply

Quote:
I'll have to isolate this coin, and there's even a name for it! "Bronze disease" - dissolving copper from the outside going in and going out!

summarised procedure per the web site: brush mold off with nylon brush,toothpick off stubborn parts, rinse with distilled water and bake below 250F to get moisture out. Thanks -will do


I hope your kidding. Do not bake any coins. The heat will do more than just get rid of moisture. Actually enough heat on a coin in the presence of Oxygen will create fast toning, corroding, tarnishing, etc. If you want to get rid of moisture on your coins, just use a blow dryer on warm. NO EXCSSIVE HEAT.
just carl
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United States
11124 Posts
 Posted 11/14/2009  7:38 pm  Show Profile Check BadThad's eBay Listings Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
It is not mold, it is verdigris. There's a big difference.

My book will be done eventually. I hope it provides collectors with all the information they need to know about verdigris.
Lincoln Cent Lover!
VERDI-CARE™ All Metal Conservation Fluid
http://www.verdichem.com
Pillar Of The Community
Philippines
1154 Posts
 Posted 11/16/2009  11:32 pm  Show Profile Bookmark this reply Add Nic to your friends list Get a Link to this Reply
Just an update, here's the same, but now, semi-cleaned coin, the yellow color somewhat faded and there's a violet tint, don't know where that came from.

Opinions and comments welcome, Thanks!




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12522 Posts
 Posted 11/17/2009  10:03 am  Show Profile Bookmark this reply Add just carl to your friends list Get a Link to this Reply
Starting to look decent. What have you tried so far. That blue color may vanish with further dipping in Acetone or Laquer thinner. Nothing to loose as this stage.
just carl
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United States
11124 Posts
 Posted 11/17/2009  8:02 pm  Show Profile Check BadThad's eBay Listings Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
Now it looks harshly cleaned. What did you do to it?
Lincoln Cent Lover!
VERDI-CARE™ All Metal Conservation Fluid
http://www.verdichem.com
Pillar Of The Community
Philippines
1154 Posts
 Posted 11/17/2009  8:33 pm  Show Profile Bookmark this reply Add Nic to your friends list Get a Link to this Reply
yes, I think it does, just used nylon brush,toothpicked off stubborn parts, rinsed with distilled water and then... the green mold was still there... so I thought of vinigar, worked well before with copper.

submerged it in coconut vinigar, swished it around for only 15seconds and rinsed again, tap water.

that violet tint just suddenly came up, without that tint, it would be ok


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