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<p>[QUOTE="-jeffB, post: 2789136, member: 27832"]I don't have any experience with rhodium plating, but a bit of Googling indicates that step one in the process is <b>cleaning and polishing</b> the piece to be plated. Do you find that this often isn't done?</p><p><br /></p><p>As for <i>removing</i> a rhodium-plating layer, rhodium is a platinum-group metal, and I'm not sure how you'd attack it without attacking the underlying gold. If there's a nickel preplating layer, maybe you can get through to that and loosen it from underneath...? I remember coming across an article some time back on ionic liquids that can selectively attack some platinum-group metals while sparing others, but I don't think that's made it into commercial practice yet.</p><p><br /></p><p>I still think it's a color-balance issue. I'll try to get some pictures this evening showing the effect, but it'll be hard, given all the time I've spent learning to <i>avoid</i> the effect...[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 2789136, member: 27832"]I don't have any experience with rhodium plating, but a bit of Googling indicates that step one in the process is [B]cleaning and polishing[/B] the piece to be plated. Do you find that this often isn't done? As for [I]removing[/I] a rhodium-plating layer, rhodium is a platinum-group metal, and I'm not sure how you'd attack it without attacking the underlying gold. If there's a nickel preplating layer, maybe you can get through to that and loosen it from underneath...? I remember coming across an article some time back on ionic liquids that can selectively attack some platinum-group metals while sparing others, but I don't think that's made it into commercial practice yet. I still think it's a color-balance issue. I'll try to get some pictures this evening showing the effect, but it'll be hard, given all the time I've spent learning to [I]avoid[/I] the effect...[/QUOTE]
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