The name of the solution that fixes the image onto the photographic paper is thiosulfate salt. This is further explained below.
<h3>What is
thiosulfate salt. </h3>
Generally, An inorganic sodium salt known as sodium thiosulfate, sodium thiosulfate is made of sodium and thiosulfate ions in a ratio of 2:1.
In conclusion, Thiosulfate salt is the name of the solution used to permanently fix the picture on photographic paper.
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Answer: C- Engraving
Explanation: accomplished by pushing small v-shaped metal rod called a burin, across a metal plate, usually of copper or zinc, forcing the metal up and off the plate in slivers. Line engravings were commonly used to illustrate books and reproduce works of art in the era before photography.
