Honestly, I'm afraid to check. :oOriginally Posted by Sean
I'm not sure what the optimal humidity level would be, but I'd guess something in the 60-80% level. Too high, and the dust might be replaced by mold spores.
The question, I suppose, is whether increased humidity eliminates the electrostatic aspect of the air that might support the dust, versus the idea of micro-condensation that causes the dust to settle out of the air onto available surfaces (e.g. drying film, negatives, etc.).