"A lot that has been written on the subject dates
from when hardening fixers were used. Now that
hardening fixer is generally not used, that is not
such an issue,..."
Not "...such an issue..." is the ph of the hca.
"...although the pH of the wash aid is still considered
worth keeping at around the level of the Kodak product."
The Kodak HCA's ph; perhaps 7 or a fraction more?
Some one with a ph meter and the Kodak product?
Were a pole taken I believe we would find that the
Kodak ph is favored more so by those not eager
to use alkaline fixers.
Your Quoteing Mr. Knoppow:
"Sulfite seems to have a specific action
which carbonates and borates do not have."
Not really saying anything. Some might infer that
sulfite Only has what it takes.
"There were extensive experiments made at Kodak Labs
testing all sorts of salts."
Likely Mr. Knoppow is refering to studies conducted in
1956 by Crabtree and Henn then published by Kodak;
Communication No. 1790.
"The measured level of thiosulfate in an emulsion was
reduced much more quickly after the sulfite bath than
after bathing in any ..."
Mr. Knoppow: <end quote>
"I have not read the original articles, but I trust Richard
K enough to accept his summary."
His summary? All he has said at end is that sulfite is
quicker. Nothing of it's short in use life span. Carbonates,
borates, and sulfates though do work and, I'd add, keep
on working. Or did work. Or work better. Has any research
been done since fifty years ago. Emulsions have
changed since the 1950s. Dan