Which environmental condition is crucial to control during long-term retention storage of micro records?

Long-term retention and storage of micro records require strict control over several environmental conditions to ensure the integrity and longevity of the records. Temperature is critical since high temperatures can accelerate deterioration. Humidity control is equally important because excessive moisture can lead to mold growth and physical damage to the records. Moreover, light exposure, particularly ultraviolet light, can lead to fading and degradation of the materials over time.

Because each of these factors—temperature, humidity, and light exposure—plays a pivotal role in preserving the condition of micro records, it is essential to manage all of them collectively. Neglecting any one of these aspects can compromise the records' integrity, making it vital to control all three to safeguard the materials effectively during long-term storage.