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Museums increasingly rely on preventive conservation, adjusting humidity and light levels to —slowslowlyslowingslowed the rate of material decay rather than repairing objects after damage occurs. Textiles and paper are especially —vulnerableresistantimmunereluctant to ultraviolet exposure, so galleries fit filtered glazing to limit fading. Conservators also keep detailed condition reports, allowing any —gradualgraduategraduallygraduation deterioration to be noticed early and treated before it becomes —irreversiblereversibleinvisibletemporary.