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What temperature and humidity conditions help preserve paintings on paper?

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Inside the ongoing preservation of the Vatican — Art conservation and restoration Learn about the restoration of tiles in St. Peter's Basilica, Vatican City.

To preserve paintings on paper, it is essential to maintain a stable environment, as these works are sensitive to fluctuations in their surroundings.

For optimal preservation, the recommended environmental conditions are:

Relative Humidity: 50–55 percent1
Temperature: 60–68 °F (16–20 °C)1

Maintaining these specific ranges is critical for the protection of organic materials. Consistent monitoring of humidity and ventilation is also necessary to prevent the growth of mold on the sizing and paint media, as well as to discourage infestations by pests such as silverfish or book lice.1

Beyond climate control, it is vital to limit light exposure, particularly ultraviolet light, which causes cumulative and irreversible damage, including color loss and distortion. Furthermore, all storage and framing should utilize 100 percent acid-free, preferably all-rag, materials to prevent acidic transfer to the artwork.1