TESTING THE FIXING SOLUTION :
There is a very simple
test that can be carried out to test the silver saturation of the fixer
and it is a reaction of potassium iodide to the silver absorbed into the
fixer bath. By placing several drops of the Kodak Fixer tester FT 1 in
the fix ( this is a 5% solution of Potassium Iodide) the concentration
levels can be determined. If the liquid stays clear, the fixer is still
OK, but if there is a thicker yellow white stain in the bath from a reaction
with the potassium iodide then the bath is exhausted and should be discarded.
When you mix a new
fixer solution it is also good practice to discard the stop bath and mix
a new solution at the same time.
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