Roman coins soaked in olive oil. Before the soak, they had the appearance and feel of disc-shaped sandstone rocks from centuries of concretion. The turquoise color is from dissolved copper oxide.
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Roman Coins

Added to Roman Coins and categorized in — 8 months ago

Roman coins soaked in olive oil. Before the soak, they had the appearance and feel of disc-shaped sandstone rocks from centuries of concretion. The turquoise color is from dissolved copper oxide.