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15–20°C and humidity of 40–50% — it seems simple. But what happens if the conditions are violated? We explain the science of proper coin storage and give practical advice.
Storage conditions: temperature and humidity
Even the best capsule will not save a coin if the storage conditions are unacceptable. The physical environment is of great importance.
Temperature
The optimal temperature for storing coins is 15–20°C. Sharp temperature changes are dangerous due to condensation: when a cold coin enters a warm room, a microfilm of moisture can form on its surface. That is why, after removing coins from a cold room or car in winter, they should be allowed to gradually warm up in a closed package without opening.
Humidity
The recommended relative humidity is 40–50%. Higher humidity accelerates corrosion, lower humidity leads to drying out of some materials. You can use a hygrometer (humidity meter) to control humidity.
If the humidity in the room is high (basements, bathrooms) - do not store coins there. In such conditions, even short-term storage can lead to irreversible damage.
Humidity control agents
- Silica gel - absorbs moisture. Silica gel packets can be placed in a safe or box with coins. Regularly check and replace the saturated silica gel.
- Dehumidifiers - for large storage areas or rooms with high humidity.
- Anti-tarnish strips - special strips that absorb corrosive gases. Especially useful for silver coins.
Lighting
Exposing coins to direct sunlight or ultraviolet light for extended periods of time is not recommended. The sun's UV rays can accelerate chemical reactions on the metal surface. Store coins in dark places or use opaque containers.