Chemistry of Walter Mitty's negative developer/stop bath/fixer? I asked a question here How can Walter Mitty examine the negatives of photos in the bright sunny day?

Commonly known, there are three steps using chemical baths to bring out the images of negatives:


developer to bring out the image, 
"stop bath" to halt the process, 
"fixer" to make the image permanent. 


So in details what are the Chemical procedure/compounds/reaction for the negative's developer/stop bath/fixer? 

Wish the answer is in depth.
basics here: http://science.csustan.edu/nhuy/chem1002/photoexp.htm

In depth: there are many good books about the chemistry of photography, starting with this 120-year old classic:
https://archive.org/details/chemistryphotog02meldgoog
‎
Here is another that's fully available online and recent enough to cover every major aspect of the subject:
https://openlibrary.org/books/OL5953553M/Photographic_chemistry_in_black-and-white_and_color_photography

You can buy more recent books, especially for developments in color.