In 1909, Imogen Cunningham invented a cheaper photographic printing paper.
In 1909, Imogen Cunningham developed a photographic printing paper that used lead salts as a cost-effective alternative to the platinum papers most photographers used during her time. This innovation significantly decreased costs in professional photography, making it more accessible. Her invention not only showcased her technical prowess and understanding of chemistry but also displayed a deep commitment to innovation in the photographic arts. Although specific monthly and daily documentation of this invention is lacking, its importance remains significant in the history of photography.