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RH of 65% - what salt to use?

Dear sirs,

I would like to know how I can have in a closed room an RH of 65%, what sort of salt I have to use ? And what should be the concentration of the salt ?

Best regards,

Giorgio Mardegan
Sacco Srl - Cadorago, Como, Italy

Sodium nitrate is stated to give 66% at 70 degrees F. All such salt control systems use a saturated solution.

Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.

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