Albumen prints were the most popular kind of prints in the 19th century. Albumen prints have a slight sheen rather than a glossy surface. In good condition, they have rich purple or red tones, and sharp detail. Deteriorating images are often yellow-brown with yellow highlights and faded shadows. The emulsion layer of the print often has a fine network of cracks visible to the eye. Color pigments were often added to enhance the image.