Kirk;

There are 3 editions of Mason. They are 1966, 1975 and 1979. The one I have quoted from regarding fixing and washing is the 3rd edition.

Another fine book is "Photographic Chemicals and Solutions" by Crabtree and Matthews but being from 1939 is rather dated. Another one is "Photographic Chemistry" by Eaton. I have quoted from it and posted a few pictures here showing emulsion making at Kodak.

PE