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<p>[QUOTE="Bryan Jellick, post: 4843667, member: 114306"]On bronze indian head cents that have light BD after experience have achieved good results with Sodium Sesquicarbonate as directed in a glass container with a sealing lid: 1-2% for coins with a desirable patina or 5% for one day if BD is bad. I will usually warm the distilled water to dissolve the powder and then place the coin in for a day or two, checking the patina and observing the verdigris. After a day i have often found soft sable brush in the solution gently will remove verdigris. I have found too strong a solution or too long can change the patina bluish...which is not ideal, so go easy. I will also alternate days with plain distilled water to steal more cuprous metal ions. I have found that even the distilled water soak really does loosen dirt dissolve the verdigris. Change water daily or every two days. I don't do this for more than a week. I'm not looking for shine or perfection just a reduction of cuprous metal and stabilization. Follow same standard for drying and storage. I do use silica packets in my case and have not seen any return of BD for a year now.[/QUOTE]</p><p><br /></p>
[QUOTE="Bryan Jellick, post: 4843667, member: 114306"]On bronze indian head cents that have light BD after experience have achieved good results with Sodium Sesquicarbonate as directed in a glass container with a sealing lid: 1-2% for coins with a desirable patina or 5% for one day if BD is bad. I will usually warm the distilled water to dissolve the powder and then place the coin in for a day or two, checking the patina and observing the verdigris. After a day i have often found soft sable brush in the solution gently will remove verdigris. I have found too strong a solution or too long can change the patina bluish...which is not ideal, so go easy. I will also alternate days with plain distilled water to steal more cuprous metal ions. I have found that even the distilled water soak really does loosen dirt dissolve the verdigris. Change water daily or every two days. I don't do this for more than a week. I'm not looking for shine or perfection just a reduction of cuprous metal and stabilization. Follow same standard for drying and storage. I do use silica packets in my case and have not seen any return of BD for a year now.[/QUOTE]
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