It depends on the storage conditions. Molds usually like dampness and warmth. Remove those and they die. The problem is the spores which will stay active for a very long time so when the humidity and heat are brought back they begin growing.
On the good side, the stuff that causes foxing seems to be rather slow growing. And I'm pretty sure it needs a certain acidity to live. so deacidification and good storage should stop it for a long time.
Steve B
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