Heico Perma-Wash, Archival Black & White Film and Paper Pre-Wash, 1 Qt. Makes 11 Gallons Heico Perma Wash is a highly concentrated neutral liquid that saves tons of time and wash water, and adds archival permanence Perma Wash saves more than 90% of normal wash water requirements Perma Wash is non-corrosive and is formaldehyde free A one quart bottle will make 11 gallons of working solution.