Which chemical did Herschel discover could effectively dissolve unexposed silver salts to permanently fix an image?
Answer
Sodium thiosulphate
Herschel solved the challenge of making images permanent by discovering that sodium thiosulphate could dissolve the unexposed silver salts on the light-sensitive material, a chemical later known as 'hypo'.
Related Questions
What Greek words did Herschel derive the term 'photography' from?Which chemical did Herschel discover could effectively dissolve unexposed silver salts to permanently fix an image?In what year did Sir John Herschel invent the cyanotype process?What common trade name became universally known for sodium thiosulphate, Herschel's fixing agent?What insoluble pigment results in the distinctive blue color of a finished cyanotype print?What essential conceptual structure, foundational to later film photography, did Herschel introduce alongside the term 'photography'?What types of salts formed the chemical basis of the cyanotype process, differentiating it from silver-based portraiture chemistry?Which chemical is one of the two primary components Herschel used to coat surfaces for the cyanotype process?Herschel viewed his photographic experimentation primarily as what kind of problem to solve?Besides his work in photography, Sir John Herschel succeeded which famous relative in astronomy?