PMK Pyro is a staining-type developer which yields fine grained negatives with superb sharpness and highlight detail * The 50-liter PMK Liquid Kit is supplied as one-half liter of stock solution A, and one liter of stock solution B to make 50 liters working solution * An alkaline or pH neutral fixer is recommended for achieving maximum pyro stain on the negative. A conventional rapid fix may diminish staining effects of pyro and PMK formula. * Formerly known as Kodalk * Highly suited for use with the Zone System * Long shelf life