Fig. 6: The high-density negative film before and after stimulated contamination treatment.
From: Effect of microbial contamination of black and white photographic negative films on developed photos
(a) The exposed B&W photographic negative film with high-density Ag particles; (b) the B&W photographic negative film after exposure with high-density Ag particles covered with the lens wiping paper; (c) the unexposed B&W photographic negative film denoted as low-density film sample; (d) the unexposed B&W photographic negative film covered with the lens wiping paper.
