Any paper having a grain or texture suitable to the subject under treatment may be used as transfer paper in the carbon process of photography. The paper is coated with a solution of gelatine containing chrome alum, which forms an insoluble surface to which the tissue may be squeezed. The final support (when the picture is first developed on waxed opal and transferred by squeegeeing a sticky surface to it) is coated with soluble gelatine, which, placed in warm water, readily attaches itself to the insoluble tissue, and, on drying, adheres so firmly that the latter will spontaneously leave its waxed support. The paper is coated by drawing it over melted gelatine contained in a trough, the gelatine being kept liquid by an outer water jacket. These transfer papers cannot be well made in small quantities as cheaply as they can he purchased.