Section 39.04 - Film Base Materials(1)Original film. All microfilm records regulated by 950 CMR 39.00 shall be generated on polyester-base silver gelatin-type film. All such film shall conform to the standards set forth in the American National Standards Institute publication, Specifications for Safety Photographic Film, ANSI PH 1.25. Such film shall comply with the minimum standards of quality for film rated LE-500 described in Imaging Media (Film) - Silver-G elatin Type - Specifications for Stability, ANSI/NAPM IT 9.1.(2)Duplicates. The original, or first generation silver film shall be maintained for security purposes and not for reference. At least one duplicate copy of all records filmed shall be prepared for reference purposes. For records having a permanent retention period or for records for which a retention period has not been assigned, a duplication master shall be produced from the master negative. Duplicate copies for reference or additional duplicate copies for security may be of the diazo, silver halide or vesicular composition. Duplicates shall be commensurate in quality with the original and shall comply with the minimum standards set forth in Recommended Practice for Operational Procedures/Inspection and Quality Control of Duplicate Microforms of Documents and from COM, ANSI/AIIM MS 43.