What not to store coins in?
Numismatic collectors and coin enthusiasts must avoid storing valuable currency and rare coins in improper materials that accelerate chemical degradation, corrosion, or physical damage. Coins should never be kept in old-fashioned polyvinyl chloride plastic flips or soft plastic coin sheets, as chemical plasticizers degrade over time, leaving a sticky green residue that permanently damages metal surfaces. Additionally, avoid storing coins in unsealed cardboard boxes exposed to high humidity, acidic paper envelopes, or standard household cleaning environments.
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