Talbot pioneered the negative-positive photography system.
In 1835, Talbot developed the first negative photographic paper to print a positive image. In January 1839, he applied to the French and British academies. But his invention from negative to positive created a new starting point for modern negative public welfare. In 1841, Talbot's "negative-positive system" photography was patented in England. It was later named "Carrot Photography".