The youth perhaps does not know this is what, I tell you this is film. Is film used what to do? Perhaps somebody can ask. Film is used take a picture, and film has effectiveness for a given period of time, general 23 period of efficacy, can be the film that expires 40 years still used? Of course, the likelihood cannot be used. Film renown negative, phenanthrene forest, it is one kind is become resemble equipment. The film that uses extensively is halogenate silver daub is in get together second acerbity ester piece base on, this kind of negative is soft, roll into is whole go to the lavatory use. When glazed line illuminate arrives on halogenate silver, halogenate silver change is black silver, secure after classics develop craft at piece base, become us to often see black and white negative. Chromatic negative criterion daub three-layer halogenate is silver-colored in order to behave 3 primary colors. Besides negative still positive is reached into wait a moment like negative. The world entered digital period 2000, digital camera floods film the distance in the history, what general youth perhaps knows is not much. Friend, do you still have this kind of film? Wherefrom does the photography person that the times walks over still have memory?