Most dehumidifiers won't drive moisture levels much below 30% RH. Mould will definitely grow at that level. I never store photos in wood or cardboard containers or in paper folders (provides mould growth medium) - metal only. I use glassine sheets to separate the photos when stacked. If you really want or need to drive the moisture down, use desiccant packs in the closed storage container (in addition to a general humidity control). The photo media/paper itself could be attractive to mould. Mould is insidious - I used to live in Florida and had growth in bright sunlight and sometimes surviving occasional (diluted) bleach baths. Sent from my iPhone... Ron Williams
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Re: Storage - mould
2014-09-15 by Ron Williams