How does the optimum humidity level for preservation of arts and antiquities compare to other environments?

Most indoor environments can tolerate reasonably wide varia- tion in relative humidity (RH) – say between 40 and 60 per cent RH for an o ce – without ill e ects. The sensitivity of antiques, works of art and other heritage objects to variation in RH means that they require closer control to ensure the RH varies by only a few per cent.

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