Kodak XTOL Black and White Film Developer kit is an excellent choice for achieving fantastic sharpness, contrast balancing and fine grain in your photos. This developer takes full advantage of the film's ISO rating and is particularly useful for push-processing. The powder concentrate Part A and Part B are easily mixed with water to make 5L of working solution with a long usable life and there's no need to extend the developing time with reuse.XTOLis one of the few developers that do not contain hydroquinone. It uses derivatives of ascorbic acid (vitamin C) and phenidone as developing agents. Claimed advantages include low toxicity which is important for environmental reasons as well as occupational safety. High-quality, versatile black&white film developerExtremely fine grain and high sharpnessFull emulsion speed for great shadow detailSuitable for push/pull processingPart A 244g plus Part B 270g powder concentrate mix to make 5L