A Photographic Method for Simplifying Assembly of Composite Negatives.

Assembly of complicated composite negatives is easily accomplished by the use of photographic products which depend for their utility on the Herschel effect. A description of this effect is given. The use of this method depends on the unique characteristics of a photographic product in which yellow light exposure lowers the density and subsequent white light exposure restores density. A complete practical demonstration is made in which Kodak Autopositive Film, Thin Base, is employed to illustrate the usefulness of these characteristics in assembling an otherwise complicated negative.