Looking at the Sodium Benzenesulfonate further it's use is given in at least 4 Fuji Patents as an anti-oxidant, alongside other examples such as Suphites or Metabisulphites themselves and Ascorbic acid. It's also used in photothermography by some US companies..

If Agfa did or do still use it then it's possible that anyone trying to analyse Rodinal might think Sodium Benzesulfonate or another similar anti-oxidant was an unidentifiable fevloping agent. Ilford patented some anti-oxidants in the 1950's presumably for use in Ilfosol originally a Phenidone/Glycin based developer, and these can also be used to form developing agents. (4-aryl-2-oxytetronimic acids).

So thanks that's useful information.


Quote Originally Posted by pavelt2tk0 View Post
BTW, Guys going through all this posts, I also tried to mix some Rodinal.

I used this recipe:
Sol A:
water 500ml
p-aminophenol 50g
potassium metabisulfite 150g

Sol B:
water 300ml
Sodium hydroxide 100g

Sol C:
water 50ml
Potassium Bromide 5g
Sodium benzenesulfonate 0.3g

This recipe comes from Soviet Union the most known book, and states this as Foma R09 Rodinal recipe. The only difference - the formula asks for p-aminophenol hydrochloride or hydrosulfate), but looking at your discussion this is definitely the mistake. It must be the base.

The principle is almost the same as usual - slowly add Sol B into Sol A, until precipitate almost dissolved.
The add Sol C, and water to make 1l.
Sodium benzenesolfonate is used to prevent oxigen diffusion into the solution. Greatly extends it life. Has no effect on the developer.

Looks it is very similar in it's activity and properties to Agfa modern Rodinal, what is different - the color, it is very light when fresh.