I know I’m talking wet instead of dry here, but my harps go wet or dry depending on where I’m playing…home, outside, violent AC (cold and dry).
I wonder why people worry about this because if you are moving your harp in and out of places to play jobs, the humidity varies constantly. Personally, I never give it a thought….unless it’s near the ocean…then the harp gets practically wet and has to go inside to dry off before being covered. That scenario is rare, but it’s happened a couple of times. The newer finish (lacquered) withstands the humidity better than the stained finish, which is one reason I try to use my Etude outside instead of my LH15.
They’ve both been exposed to extremes of temp and humidity, and they still work OK. What was supposed to happen to them, I wonder?