Experiments
During the 1870s photographers used the common wet-plate, which required a lot of on-the-spot preparation for immediate exposure. Although not a new idea, photography was still in its early stages of experimentation. Berkeley experimented with the pre-coated, semi-dry collodian plates which were commercially available at that time. He discovered that with the addition of sulfite to Samman's developing solution, in order to absorb the sulphur dioxide, which was given off by the chemical dithionite, that dithionite was no longer required in the developing process. Berkeley published his discovery in 1881.
Read more about this topic: Herbert Bowyer Berkeley
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