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<p>[QUOTE="Roerbakmix, post: 7382912, member: 100731"]This rare medieval coin of Gottfried II von Heinsberg was in rather poor condition, with a thick find patina (probably mostly AgSO4 and AgCl) and a large albeit superficial iron oxide deposit on the reverse.</p><p>[ATTACH=full]1285440[/ATTACH]</p><p>Using a brief immersion in sodium thiosulphate, followed by aprox. 15 minutes of local application of (very concentrated) synthetic citric acid, followed gentle rubbing of a cotton swab and bamboo tooth stick on the iron oxides (reverse), I ended up with this:</p><p>[ATTACH=full]1285441[/ATTACH]</p><p>Gottfried II von Heinsberg, 1303-1331. Denar (Köpfchen), Blankenburg or Heinsberg mint. A local imitation of the contemporary coinage of the Dutch counts Floris V and Willem III. Rare - but this variant is even scarcer as the typical four flowers in the reverse fields are omitted.</p><p><br /></p><p>I restored this coin after a very busy ER shift of 12+ hours ... this gave me an immense satisfaction following the chaotic shift.[/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 7382912, member: 100731"]This rare medieval coin of Gottfried II von Heinsberg was in rather poor condition, with a thick find patina (probably mostly AgSO4 and AgCl) and a large albeit superficial iron oxide deposit on the reverse. [ATTACH=full]1285440[/ATTACH] Using a brief immersion in sodium thiosulphate, followed by aprox. 15 minutes of local application of (very concentrated) synthetic citric acid, followed gentle rubbing of a cotton swab and bamboo tooth stick on the iron oxides (reverse), I ended up with this: [ATTACH=full]1285441[/ATTACH] Gottfried II von Heinsberg, 1303-1331. Denar (Köpfchen), Blankenburg or Heinsberg mint. A local imitation of the contemporary coinage of the Dutch counts Floris V and Willem III. Rare - but this variant is even scarcer as the typical four flowers in the reverse fields are omitted. I restored this coin after a very busy ER shift of 12+ hours ... this gave me an immense satisfaction following the chaotic shift.[/QUOTE]
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