Litho F is a single-solution black and white developer, excellent for working with litho derivations, solarizations, posterizations, title slides, etc. Also can be used for making line negatives on litho-coated paper and film. By enlarging an ordinary "continuous tone" negative onto litho paper, and developing it in Litho F, a high-contrast positive image is obtained with the middle tones tending to "drop out". When litho film positive is printed by contact onto another sheet of litho film and again developed in Litho F, the degree of middle tone "drop out" increases and the resulting litho film negative can then be printed by enlargement or contact onto regular photo printing paper. The results....unlimited litho derivations, silhouettes, solarizations, posterizations or bas-relief effects.