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Shipwreck immersion profoundly alters silver coins through prolonged exposure to seawater. Saltwater accelerates corrosion, forming silver chloride crusts that adhere to surfaces, often obscuring details. On this half dollar, such encrustations appear as irregular white or gray patches, particularly in protected areas like lettering and recesses.
Yet, the anaerobic environment below sediment can preserve coins remarkably, halting oxidation and retaining luster in exposed high points. For the 1844-O example, gentle conservation has removed much marine buildup, revealing original mint bloom beneath, while leaving subtle toning that attests to its underwater odyssey for over a century.
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