Collodion n. (Chem.) A solution of pyroxylin (soluble gun cotton) in ether containing a varying proportion of alcohol. It is strongly adhesive, and is used by surgeons as a coating for wounds; but its chief application is as a vehicle for the sensitive film in photography.
Collodion process (Photog.), a process in which a film of sensitized collodion is used in preparing the plate for taking a picture.
Styptic collodion, collodion containing an astringent, as tannin.
... result is a black and white negative. That is, the lines that were black in the drawing are absolutely clear and transparent in the negative, but the rest of the negative is black. From the photographer, the negative goes to the "negative-turning" room. Here the negative is coated with solutions of collodion and rubber cement, which makes the film exceedingly tough—so tough that it is easily stripped from the glass on which it was made, and is "turned" with the positive side up on another sheet of glass. If this were not done, the plate ... — The Building of a Book • Various Read full book for free!
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