Hi All
Just bought some Agfa Viradon,, and on the instructions it says to dilute1
to 50 for usage.
Then it says After toning wash thoroughly Na sulphite 10%, prevents
posttoning.
Could someone please explain the "Na sulphite10%" as I do not understand.
Also what is the best way to use this toner to get the best results? I have
never used it before.

Many thanks in advance