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Treasure Hunting
Treasure, Coin and Relic
iridescent lamination in bottles
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<blockquote data-quote="user 4386" data-source="post: 639675" data-attributes="member: 4386"><p>Solarization - the effect of sunlight (UV light) on glass that contains impurities such as manganese results in it becoming green, brown or purple over time. Less common after WW1 as less manganese in glass after then in the main. Copper and chromium tracres can do the same.</p><p></p><p>You still have the same issue if it was something that accreted later or earlier from the contents of the bottle - that it is evenly accreted. If the cork was inside it, it may have been protected from sea water for a long time. A full bottle could explain the evenness of accretion. Not many things react so significantly with glass - what happens when you hold slivers of it in a candle flame (melt? flame colur? burn? nothing?)/</p></blockquote><p></p>
[QUOTE="user 4386, post: 639675, member: 4386"] Solarization - the effect of sunlight (UV light) on glass that contains impurities such as manganese results in it becoming green, brown or purple over time. Less common after WW1 as less manganese in glass after then in the main. Copper and chromium tracres can do the same. You still have the same issue if it was something that accreted later or earlier from the contents of the bottle - that it is evenly accreted. If the cork was inside it, it may have been protected from sea water for a long time. A full bottle could explain the evenness of accretion. Not many things react so significantly with glass - what happens when you hold slivers of it in a candle flame (melt? flame colur? burn? nothing?)/ [/QUOTE]
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Treasure Hunting
Treasure, Coin and Relic
iridescent lamination in bottles
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