Читать книгу Coin Collecting For Dummies - Neil S. Berman - Страница 70

Keepin’ ’em dry

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Most holders aren’t meant to be watertight or airtight; other holders claim to be so. We suggest erring on the side of caution by assuming that every holder allows air or water to enter. Take the same precautions with all holders, regardless of the claims made by the manufacturers.

The changes that occur on the surface of a coin are at the chemical or molecular level, so you won’t always be able to see them. All it takes for air and moisture to seep in is a tiny hole.

Coin Collecting For Dummies

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