PHOTO WASTE, XRAY WASTE, FILM
Significant amount of recoverable silver remains in unprocessed Black & White film materials such as negatives, motion picture films, x-ray film, and microfilms. Processed B&W materials have about half the amount as unprocessed.
Unprocessed color film contains a much smaller amount of silver than B&W materials. Processed color negatives, transparencies, and prints do not contain silver.
Various companies can recover silver from film and photo developing solutions for little or no charge depending on quantity. See Hazardous Waste Disposal Contractor list.
Wastewater utilities have restrictions on photo process wastes that can be discharged into the sewer. Contact you local wastewater utility.