The year 1885 has been remarkable for the great importance of the numerous improvements in photographic processes that have been brought before the profession, and for the great impetus thereby given to the extension of the uses of the art.
The substitution of paper for glass as a vehicle for sustaining the sensitive film has long been an aspiration of the progressive photographer; and this year has witnessed the perfection of at least two paper film processes that may be said to be perfect.
The Eastman paper film has already established itself as a practical success, and now we have a new candidate for photographic favor in the Roche Film, just perfected and patented by that able experimentalist, and assigned to Messrs. Anthony & Co.
This Roche Film is remarkable for the ingenious manner by which the disagreeable necessity for oiling the paper is avoided.
This particular improvement consists in coating both sides of the paper with the same sensitized gelatine emulsion, which has the effect of preventing any trace of the fiber of the paper showing, from the fact that the light penetrating the front film has sufficient power to impress an image on the back film as well, the interstices between the fibres of the paper permitting a more energetic action of the light on the back film than through the fibre, equalizes the intensity and thus prevents the fibre showing in the negative when examined by transmitted light, or leaving any impression on prints made therefrom. The double impression has also the power of giving a more plucky or bolder character to the prints, and greatly enhancing the atmospheric effect and beauty of both portraits and landscape pictures. Also other imperfections, either in the front film or in the body of the paper, are corrected by the back coating, as neither the fibre of the paper nor any imperfection therein can have any effect on the front coating, but both the fibre and any spots, either opaque or transparent, in the paper or front film will affect the back image in the exact ratio of the opacity or transparency of the spots or imperfections.
In other words, all the imperfections of the paper and front film will be corrected by the back, rendering the double negative quite smooth and even, whatever the character of the texture of the paper may have been. This special paper offers other advantages. It will stand a protracted washing without weakening, and does not easily tear or crack from handling in the water, and when dried it will not curl, but remains fiat, ready for immediate use.
Directions for development accompany each package.