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<p>[QUOTE="GSDykes, post: 4023564, member: 73321"]Herein I hope to post various types of homemade "verdigris" solutions. I begin with a post from a chemist; in 2016 on CoinTalk® (!?) Greg Clark posted this formula, for a Verdigris-like compound:</p><p><br /></p><p><br /></p><p>QUOTE</p><p>"Verdigris is the name for that green stuff that gets on improperly stored copper coins.</p><p>There are several 'over the counter' remedies you can buy but the best thing is to understand the chemistry of verdigris and how to use chemistry to fix it.</p><p><br /></p><p>You do NOT need any chemistry knowledge to make the solution and combat this nasty chemical reaction.</p><p><br /></p><p>Before getting into the weeds on this subject let me qualify my diagnosis and the solution to this problem.</p><p>I am a chemist and understand the chemical processes that takes place over time which produces verdigris. I also understand the process to correct it's destructive properties.</p><p><br /></p><p>I must tell you that this process can take up to several weeks to complete. That should not come as a surprise since it probably took many years for the reaction that produced this nasty green stuff.</p><p><br /></p><p>First of all you DO NOT need to scrape, brush or otherwise clean the surface of your coins before doing this treatment. If you have nice coins of high value that are just starting to get this disease you will be able to stop it in it's tracks and restore the look of your coin. If you have coins that are beyond surface 'fuzz' you will be able to stop the reaction and neutralize the verdigris but if the verdigris had the chance to eat away at areas of the coins surface you will see the resulting pits. Your results will be a coin with rough surfaces and if the damage is bad enough it will be pitted or worse. </p><p><br /></p><p>I have used this treatment on many coppers and submitted them for grading to NGC and PCGS. The results were as I would have suspected. On coins that only had surface fuzz on them they were graded without any negative attributions. The coins that were mildly corroded received grading with notes of 'rough surfaces' and some received details grades with note of 'cleaned'. The worst all had details grading with most receiving the note 'environmental damage'.</p><p>At any rate, many of these coins would have been returned in body bags had they not been treated first.</p><p><br /></p><p>The treatment I am about to disclose is the same treatment used by all good coin preservation companies and how they treat verdigris. The best way to fight against this chemical reaction is to use chemicals to reverse it. It's by far a better choice than any other I've seen or tried.</p><p><br /></p><p>Here's the simple solution and how to make it.</p><p><br /></p><p>REQUIRED CHEMICALS AND EQUIPMENT:</p><p><br /></p><p>A simple scale accurate to 1/0 gram.</p><p><br /></p><p>Baking soda (arm and Hammer is best for purity)</p><p><br /></p><p>Soda Ash (Washing Soda....Arm and Hammer washing soda is pure soda ash)</p><p><br /></p><p>Distilled Water (DO NOT USE TAP)</p><p><br /></p><p>glass container.</p><p><br /></p><p>That is all you need.</p><p><br /></p><p>Fighting Acids with Bases.....Sodium Sesquicarbonate..</p><p><br /></p><p>Don't have sodium sesquicarbonate lying around? You can make it</p><p>with equal molar amounts of sodium carbonate (also called soda ash) and sodium bicarbonate (Baking Soda). For example, a 5% molar solution would be 10.6g of carbonate and 8.4g of bicarbonate in 100ml of water.</p><p><br /></p><p>You do not need to be spot on with the amount of water. 100 ml is one tenth of a liter. You can figure it roughly and be fine. </p><p><br /></p><p>Now understand the simple relation of molar strength (don't be concerned with this technical language) to the above formula. If the weight of the chemicals remains the same and you double the amount of distilled water you will go from a 5% solution to a 2.5% solution. On coins with nice tones you will want to use the less concentrated solution to avoid removing tones. I recommend using 1% solutions to avoid all possible problems. Understand the times required to treat the coins extends exponentially. </p><p><br /></p><p>Place the coins in a glass container and fill with a 5% solution (toughest cases) of sodium sesquicarbonate. Let them soak for about 14 days, replace the solution, and soak for another 14 days. Then, place the coin in distilled water for about a week.</p><p>A 5% solution WILL REMOVE any "patina" on the coin! If there is an exceptionally aesthetic "patina" to be preserved, try a 1% or 2% solution. Be warned, though, that it will take three times as long, and has a higher risk of being ineffective.</p><p><br /></p><p>Now you have all the information you need to treat verdigris. The time of 2 weeks with new solution and another two weeks are for the worst of the worse. Experiment on none precious coins until you get the desired results. Try the 1% on a coin with toning and try 5% on a different coin with similar tones and see what it does.</p><p><br /></p><p>Play around with it....have fun....you are now a professional copper coin preservationist.</p><p><br /></p><p><a href="https://www.cointalk.com/members/greg-clark.83030/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/members/greg-clark.83030/">Greg Clark</a>, <a href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/">Nov 9, 2016</a> <a href="https://www.cointalk.com/posts/2564067/report" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/posts/2564067/report">Report</a></p><p><a href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/">#1</a> <a href="https://www.cointalk.com/posts/2564067/like" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/posts/2564067/like">Like</a> <a href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/reply?quote=2564067" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/reply?quote=2564067">+ Quote</a> <a href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/reply?quote=2564067" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/reply?quote=2564067">Reply"</a></p><p><br /></p><p>Has anyone tried this formula?? I will try to post others as I find them.</p><p>Gary in Washington[/QUOTE]</p><p><br /></p>
[QUOTE="GSDykes, post: 4023564, member: 73321"]Herein I hope to post various types of homemade "verdigris" solutions. I begin with a post from a chemist; in 2016 on CoinTalk® (!?) Greg Clark posted this formula, for a Verdigris-like compound: QUOTE "Verdigris is the name for that green stuff that gets on improperly stored copper coins. There are several 'over the counter' remedies you can buy but the best thing is to understand the chemistry of verdigris and how to use chemistry to fix it. You do NOT need any chemistry knowledge to make the solution and combat this nasty chemical reaction. Before getting into the weeds on this subject let me qualify my diagnosis and the solution to this problem. I am a chemist and understand the chemical processes that takes place over time which produces verdigris. I also understand the process to correct it's destructive properties. I must tell you that this process can take up to several weeks to complete. That should not come as a surprise since it probably took many years for the reaction that produced this nasty green stuff. First of all you DO NOT need to scrape, brush or otherwise clean the surface of your coins before doing this treatment. If you have nice coins of high value that are just starting to get this disease you will be able to stop it in it's tracks and restore the look of your coin. If you have coins that are beyond surface 'fuzz' you will be able to stop the reaction and neutralize the verdigris but if the verdigris had the chance to eat away at areas of the coins surface you will see the resulting pits. Your results will be a coin with rough surfaces and if the damage is bad enough it will be pitted or worse. I have used this treatment on many coppers and submitted them for grading to NGC and PCGS. The results were as I would have suspected. On coins that only had surface fuzz on them they were graded without any negative attributions. The coins that were mildly corroded received grading with notes of 'rough surfaces' and some received details grades with note of 'cleaned'. The worst all had details grading with most receiving the note 'environmental damage'. At any rate, many of these coins would have been returned in body bags had they not been treated first. The treatment I am about to disclose is the same treatment used by all good coin preservation companies and how they treat verdigris. The best way to fight against this chemical reaction is to use chemicals to reverse it. It's by far a better choice than any other I've seen or tried. Here's the simple solution and how to make it. REQUIRED CHEMICALS AND EQUIPMENT: A simple scale accurate to 1/0 gram. Baking soda (arm and Hammer is best for purity) Soda Ash (Washing Soda....Arm and Hammer washing soda is pure soda ash) Distilled Water (DO NOT USE TAP) glass container. That is all you need. Fighting Acids with Bases.....Sodium Sesquicarbonate.. Don't have sodium sesquicarbonate lying around? You can make it with equal molar amounts of sodium carbonate (also called soda ash) and sodium bicarbonate (Baking Soda). For example, a 5% molar solution would be 10.6g of carbonate and 8.4g of bicarbonate in 100ml of water. You do not need to be spot on with the amount of water. 100 ml is one tenth of a liter. You can figure it roughly and be fine. Now understand the simple relation of molar strength (don't be concerned with this technical language) to the above formula. If the weight of the chemicals remains the same and you double the amount of distilled water you will go from a 5% solution to a 2.5% solution. On coins with nice tones you will want to use the less concentrated solution to avoid removing tones. I recommend using 1% solutions to avoid all possible problems. Understand the times required to treat the coins extends exponentially. Place the coins in a glass container and fill with a 5% solution (toughest cases) of sodium sesquicarbonate. Let them soak for about 14 days, replace the solution, and soak for another 14 days. Then, place the coin in distilled water for about a week. A 5% solution WILL REMOVE any "patina" on the coin! If there is an exceptionally aesthetic "patina" to be preserved, try a 1% or 2% solution. Be warned, though, that it will take three times as long, and has a higher risk of being ineffective. Now you have all the information you need to treat verdigris. The time of 2 weeks with new solution and another two weeks are for the worst of the worse. Experiment on none precious coins until you get the desired results. Try the 1% on a coin with toning and try 5% on a different coin with similar tones and see what it does. Play around with it....have fun....you are now a professional copper coin preservationist. [URL='https://www.cointalk.com/members/greg-clark.83030/']Greg Clark[/URL], [URL='https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/']Nov 9, 2016[/URL] [URL='https://www.cointalk.com/posts/2564067/report']Report[/URL] [URL='https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/']#1[/URL] [URL='https://www.cointalk.com/posts/2564067/like']Like[/URL] [URL='https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/reply?quote=2564067']+ Quote[/URL] [URL='https://www.cointalk.com/threads/verdigris-make-your-own-solution-to-eliminate-this-ugly-corrosion.286188/reply?quote=2564067']Reply"[/URL] Has anyone tried this formula?? I will try to post others as I find them. Gary in Washington[/QUOTE]
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