[Profiler (Profiler)]

I was asked about an old trick today for the care of refractor optics that instead of various desiccant satchels a small thin sealed cloth bag filled with rock salt crystals would do the same job.

Initially I thought this was a fine idea but then I wondered whether the salt might potentially also have some sort of corroding effect on the metal components of the telescope.

Consequently, while the salt might absorb ambient moisture which is good for the lens might the salt also potentially have some detrimental effect upon the metal components?

Any thoughts on this old idea would be happily received.