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<p>[QUOTE="GDJMSP, post: 4030605, member: 112"]I truly applaud your efforts for doing your own experimentation. But I think you should at least be aware that you are traveling down a road so well traveled that the asphalt, and even the cobblestones beneath it, have been completely worn away from all the traffic ! </p><p><br /></p><p>Ya see, verdigris has plagued coins that contain copper for millennia. And people have always tried to find a way to combat it. And in all that time, to the best of my knowledge, there have only been 2 commercial substances (chemical compounds) found that will successfully remove it. One is Biox, the other is Verdi-Care (and its predecessor Verdi-Gone). Biox works, but it also harms the coin. Verdi-Care on the other hand does not harm the coin. </p><p><br /></p><p>Now there are other compounds, acids for the most part, that will remove verdigris, but they all harm the coin, some more than others. And some like olive oil, which contains a very mild acid, will remove a little bit of it but that's about it. Trying pretty much anything else is a waste of time.</p><p><br /></p><p>And, you also need to remember that once verdigris forms on a coin irreparable damage has already been done to the coin. And, you also need to realize that as long as you remove moisture from the equation, or at least limit moisture as much as possible with proper storage methods, the continuing development of verdigris on a coin is stopped dead in its tracks. You can leave existing verdigris on a coin for a thousand years, literally a thousand years, and it will do no additional harm to the coin.[/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 4030605, member: 112"]I truly applaud your efforts for doing your own experimentation. But I think you should at least be aware that you are traveling down a road so well traveled that the asphalt, and even the cobblestones beneath it, have been completely worn away from all the traffic ! Ya see, verdigris has plagued coins that contain copper for millennia. And people have always tried to find a way to combat it. And in all that time, to the best of my knowledge, there have only been 2 commercial substances (chemical compounds) found that will successfully remove it. One is Biox, the other is Verdi-Care (and its predecessor Verdi-Gone). Biox works, but it also harms the coin. Verdi-Care on the other hand does not harm the coin. Now there are other compounds, acids for the most part, that will remove verdigris, but they all harm the coin, some more than others. And some like olive oil, which contains a very mild acid, will remove a little bit of it but that's about it. Trying pretty much anything else is a waste of time. And, you also need to remember that once verdigris forms on a coin irreparable damage has already been done to the coin. And, you also need to realize that as long as you remove moisture from the equation, or at least limit moisture as much as possible with proper storage methods, the continuing development of verdigris on a coin is stopped dead in its tracks. You can leave existing verdigris on a coin for a thousand years, literally a thousand years, and it will do no additional harm to the coin.[/QUOTE]
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