Emulsion Type definition

A term that refers to the make-up of a film’s emulsion.  An emulsion may be designed to be slow, grainy, fine, full of color, white and black, fast, tungsten….etc.  Each emulsion’s type is signified by a number.  For instance, Fuji uses 250D to represent that the film contains an emulsion that is daylight balanced film with an exposure index of 250.  Certain emulsion types are more desirable than others based upon one’s end purpose of the film.  It is often best to stick to one emulsion type when shooting a single unbroken sequence.