6 METHODS OF SENSITIZING CANVAS

IN THEPhiladelphia Photographer magazine of June 1868, Isaac Rehn's patent20 for sensitizing a canvas surface21, 22, 23 was described under the title of “Solar Printing on Canvas.” The process consisted of coating the canvas with a mixture of zinc white, egg albumen, ammonium chloride and silver nitrate. This solution was brushed over the canvas, which was exposed under the negative in the enlarger. The image was fixed with sodium thiosulfate in the normal manner. Albert Moore24 had a photography business at 710 Arch Street, Philadelphia, advertising the fact that he would print photos on paper or canvas from negatives supplied by clients. For a canvas 40″ � 30″ the price was $5.00, cost of canvas and stretcher extra (Fig. 7).