When it comes to developing high-quality black and white photos without blocking up highlights with over-development, the Sprint Systems 4 Liter Film Developer is the perfect choice for every photo developer. It does not contain any traces of Metol that can cause skin rashes, which makes this liquid solution safe to use. Each liter of this standard solution is capable of making up to 10 liters of working solution, which is enough to develop at least 50 rolls of 35 mm 36 exposure film or ample replenished solution for developing up to 110 rolls.