Gelatin silver process
（重定向自Gelatin Process）
The gelatin silver process is the photographic process used with currently available black-and-white films and printing papers.
The gelatin silver process was introduced by Richard Leach Maddox in 1871 with subsequent considerable improvements in sensitivity obtained by Charles Harper Bennett in 1878. Research over the last 125 years has led to current materials that exhibit low grain and high sensitivity to light.