Relative Humidity (RH) refers to the amount of moisture present in the air compared to the maximum amount the air can hold at a specific temperature. It is expressed as a percentage and is a critical factor in the preservation and display of artwork, documents, and framed objects.

Importance in Art and Framing

Excessive humidity can cause warping, mold growth, and deterioration of paper, canvas, wood, and mat boards.
Low humidity can lead to drying, cracking, and brittleness of materials.
Maintaining stable RH levels is essential for archival storage and conservation framing practices.

Recommended Levels

For most framed artwork: 40-55% RH.
For sensitive works such as watercolors, photographs, or historic documents: 45-50% RH.
Rapid fluctuations in RH are more damaging than consistently high or low levels.

Control Methods

Use of climate-controlled storage or display environments.
Employing desiccants or moisture-absorbing materials within frames or storage boxes.
Use of zeolites or other humidity-buffering agents in enclosed display environments.
Monitoring RH with hygrometers and adjusting HVAC systems accordingly.

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