Originally developed as a fast developer for press photographers, HC 110 is now widely used by large-format photographers and adherents of the Zone System. The reason? Wth this developer the negative contrast can be very precisely controlled and HC 110 takes advantage of the film's full light sensitivity while producing good shadow details. This developer is not fine grained, however. It can be heavily diluted, and so is economical for sheet film developing or for use in a school photo lab. The short developing time ensures that the film is developed before the class bell rings!