salt bath
noun
metallurgy a bath of molten salts in which steel can be immersed to soak to a uniform and accurately maintained temperature as part of the process of heat treatment. Different salts are used for different temperatures
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Examples from the Web for salt bath
Historical Examples of salt bath
Tell the Captain that I have spent the day in a salt-bath, and mean to pass the night in my bed.
Flora LyndsaySusan Moodie
Connected with the salt-works there is a salt-bath and whey-diet establishment.