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v. Simple past tense and past participle of humidify.

"The Magna Carta was then humidified, flattened and will lie untouched for at least three months under weights to reach the proper moisture level before being placed in a new case with humidified, inert gas for long-term preservation."

humidified    humidifies    humidifying   

humidified   

humidifier    humidification   

moisturize    make humid    make more humid