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<p>[QUOTE="Pavlos, post: 7455202, member: 96635"]Thanks [USER=95174]@BenSi[/USER] for the nice additional write up, I learned something more as well. It is interesting with the metro of Thessaloniki, I really wonder how many more treasures are waiting in the ground in Greece and Asia minor. I guess these will never reach the market anymore though.</p><p><br /></p><p><br /></p><p><br /></p><p>It is because they lost their silver wash, you can see just the patina color of the billon (mostly copper). It has been in the ground for perhaps 700 years. The layer of silver is so insignificantly thin, due to erosion and weathering by environmental conditions (water, heat, UV, salts, oxygen etc) it goes away. Just like when you have gold plated jewelry and after several years of wearing the layer is partly gone and you see the core metal below.[/QUOTE]</p><p><br /></p>
[QUOTE="Pavlos, post: 7455202, member: 96635"]Thanks [USER=95174]@BenSi[/USER] for the nice additional write up, I learned something more as well. It is interesting with the metro of Thessaloniki, I really wonder how many more treasures are waiting in the ground in Greece and Asia minor. I guess these will never reach the market anymore though. It is because they lost their silver wash, you can see just the patina color of the billon (mostly copper). It has been in the ground for perhaps 700 years. The layer of silver is so insignificantly thin, due to erosion and weathering by environmental conditions (water, heat, UV, salts, oxygen etc) it goes away. Just like when you have gold plated jewelry and after several years of wearing the layer is partly gone and you see the core metal below.[/QUOTE]
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