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1.They are usually in better physical condition than the other film elements. The original camera negative is often checkerboarded on several rolls, or may be chemically unstable if stored improperly.
2.They are very low-contrast and therefore help to preserve shadow detail.
3.Scratches or dirt on the IP appear as black defects on the transfer, which are generally less objectionable than white defects, which would be the case if the camera negative or internegative were used.