Just to close the door on the original question of this topic -
Sea salt does infact deliquesce to form a 75ish RH solution in a small closed container just as pure NaCl, the composition is somewhat different, but not different enough to have a meaningful effect.
Fun science -
If you wanted, instead of the salt test...you could do the..calcium chloride test. Same idea, except your hygrometer should read 33% RH. Or....the Sodium Bromide test. Your hygrometer should read 61% RH. And actually..you know what...morton lite salt i think uses some potassium chloride in it in combination with standard NaCl, so..depending on how much they use in there as a percentage of whole, i would expect that salt to give an salt test RH of probably around 80%.
Because i know these are fun things you would want to do immediately.
Comments
Sea salt does infact deliquesce to form a 75ish RH solution in a small closed container just as pure NaCl, the composition is somewhat different, but not different enough to have a meaningful effect.
Fun science -
If you wanted, instead of the salt test...you could do the..calcium chloride test. Same idea, except your hygrometer should read 33% RH. Or....the Sodium Bromide test. Your hygrometer should read 61% RH. And actually..you know what...morton lite salt i think uses some potassium chloride in it in combination with standard NaCl, so..depending on how much they use in there as a percentage of whole, i would expect that salt to give an salt test RH of probably around 80%.
Because i know these are fun things you would want to do immediately.
Never crossed my mind 'Bino....your a cool cat and a bad motor scooter in my books...