Moisture interactive materials and products formed with a polyimide material that includes metal salt (e.g., cobalt salt) portions imbedded therein such that the polyimide material is capable of absorbing, permeating, and desorbing moisture and such that the polyimide material changes in color depending upon how much moisture is currently retained by the polyimide material, the polyimide material being substantially free of oxide.
Keywords: polyamide, cobalt salt
International Class: C08J3/09, B01J20/02, B01J20/26, B01J20/28, B65D79/02, B65D81/26, G01N31/22, B29K79/00