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Silica Gel
Have a look at Indicating Silica Gel Desiccant Bags
I have not used these before but they look a reasoanble price and they show when they have been all used up by turning green. I am going to buy some and see how they work.
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All the best
Gordon
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My Kit : Nikon D200, Subal ND20, INON D180 strobes
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