Once sensitized, albumen paper is ready for printing by exposure to light through a negative. Unlike contemporary photographic papers that are developed through the use of chemical reducing agents, the silver image on albumen photographs gradually prints out, usually by exposure to the sun. Articles in this section cover both exposure of albumen papers and exposure of the collodion wet plate negatives that were typically used in conjunction with albumen prints. One of the great historic articles on the subject of albumen print exposure is Henry Peach Robinson's On Printing Photographic Pictures from Several Negatives from 1860 where he explains his technique for using multiple negatives to form a composite image. Robinson had expressly artistic ambitions for the medium of photography and felt that his manipulations raised photography "to higher purposes than we have hither to done" and his "means of producing pictures in our art are as good as those of producing paintings in Raphael's time."