Why have photographic manufactures not endeavored to unify all processes into 2 chemical processes? i.e imagine a Colour Positive, Colour Negative, Black and white positive and Black and white negative film all being able to run through 1 kind of chemistry. Wouldn't this mean greater accessibility for people to have their material processed at labs? and why not make such a system for printing where there is positive and negative papers both colour and black and white which all run though one chemical system. pretty much what im asking is why haven't manufactures in this time of ecconomic rationalism tried unify all the processes? imagine slide film being processed through C-41 just like Print film was.... the transperancies from Kodak print film were AWESOME! why cant there be a modified in camera version and we ditch E-6?