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Treasure Hunting
Cleaning Your Finds
Cleaning cupronickel coins 1930's French Francs
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<blockquote data-quote="GypsyGoldAu" data-source="post: 311481" data-attributes="member: 5873"><p>My advice would be to start with the 'heavier' methods followed by each stage as less & less severe....bit like painting a car or wall etc,.. the final finish will only be as good (reflective polish state) as the way you layer each level of abrasion from heavy to light. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /> </p><p></p><p>eg, perhaps use the bi-carb rub 1st, followed by a dunking, and finally if desired, a polish of firstly with Brasso, and finally with some Silvo</p><p></p><p>I wouldn't advise <u>ANY</u> of the above if you had recovered a 'collector's item' though.... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>As to the 'dull' copper coat, swift abrasion with a scotch pad can brighten that up....that will be the copper content 'leeching' out of the broken down surface of the coin...perhaps a longer soak will remove the 'oxidized' leeching and follow with a clean up???</p><p></p><p>Nickel does tend to look 'pinkish'...yet when side by side with chrome, it looks to be more 'yellow'...whereas 'cobalt' will look more 'blue' :Y:</p></blockquote><p></p>
[QUOTE="GypsyGoldAu, post: 311481, member: 5873"] My advice would be to start with the 'heavier' methods followed by each stage as less & less severe....bit like painting a car or wall etc,.. the final finish will only be as good (reflective polish state) as the way you layer each level of abrasion from heavy to light. :cool: eg, perhaps use the bi-carb rub 1st, followed by a dunking, and finally if desired, a polish of firstly with Brasso, and finally with some Silvo I wouldn't advise [u]ANY[/u] of the above if you had recovered a 'collector's item' though.... ;) As to the 'dull' copper coat, swift abrasion with a scotch pad can brighten that up....that will be the copper content 'leeching' out of the broken down surface of the coin...perhaps a longer soak will remove the 'oxidized' leeching and follow with a clean up??? Nickel does tend to look 'pinkish'...yet when side by side with chrome, it looks to be more 'yellow'...whereas 'cobalt' will look more 'blue' :Y: [/QUOTE]
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Treasure Hunting
Cleaning Your Finds
Cleaning cupronickel coins 1930's French Francs
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