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<p>[QUOTE="Roerbakmix, post: 3774870, member: 100731"]No offence taken <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /> I still believe this coin would greatly benefit from a sodium thiosulphate immersion: I would definitely do it. Mechanical cleaning is, in my opinion perfectly okay if done properly (i.e. correct use of force with the correct tools). Though a bamboo skewer will likely not harm the coin, I noticed some scratches on the coin that were not there before. On this coin of a likely high silver concentration, I would personally refrain from doing so and stick to the chemical arsenal.</p><p><br /></p><p>However, what [USER=19463]@dougsmit[/USER] says is correct:</p><p><br /></p><p>You won't know what's beneath the corrosion until you remove it. However, as I pointed out in my first post, the breaking lines in the horn silver are a good indication of a solid, smooth surface below.</p><p>E.g., the deposit depicted here, with clear breaking lines:</p><p>[ATTACH=full]1009199[/ATTACH]</p><p>was easy to remove, while the rough deposits without clear breaking lines (below), were not.</p><p>[ATTACH=full]1009201[/ATTACH]</p><p><br /></p><p>In conclusion: you already have a coin with a rough appearance, with a decent chance of a smooth surface below, and a relatively smaller chance of a rough surface below (i.e. your starting point). The 'pure' silver, nor the silver sulphate patina will be altered by the sodium thiosulphate - it reacts with the chlorides or bromides only. I would still do it. It's fun <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 3774870, member: 100731"]No offence taken ;) I still believe this coin would greatly benefit from a sodium thiosulphate immersion: I would definitely do it. Mechanical cleaning is, in my opinion perfectly okay if done properly (i.e. correct use of force with the correct tools). Though a bamboo skewer will likely not harm the coin, I noticed some scratches on the coin that were not there before. On this coin of a likely high silver concentration, I would personally refrain from doing so and stick to the chemical arsenal. However, what [USER=19463]@dougsmit[/USER] says is correct: You won't know what's beneath the corrosion until you remove it. However, as I pointed out in my first post, the breaking lines in the horn silver are a good indication of a solid, smooth surface below. E.g., the deposit depicted here, with clear breaking lines: [ATTACH=full]1009199[/ATTACH] was easy to remove, while the rough deposits without clear breaking lines (below), were not. [ATTACH=full]1009201[/ATTACH] In conclusion: you already have a coin with a rough appearance, with a decent chance of a smooth surface below, and a relatively smaller chance of a rough surface below (i.e. your starting point). The 'pure' silver, nor the silver sulphate patina will be altered by the sodium thiosulphate - it reacts with the chlorides or bromides only. I would still do it. It's fun :)[/QUOTE]
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