Home › CFR › Title 40 › Part 45940 CFR Part 459 — Photographic Point Source CategorySubpart A — Photographic Processing Subcategory§ 459.10— Applicability; description of the photographic processing subcategory.§ 459.11— Specialized definitions.§ 459.12— Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.