sulfite + developer

Film Photography & Darkroom discussion

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Posts: 2
Joined: Sat Feb 16, 2013 8:59 pm

sulfite + developer

Postby catcattttt » Sat Feb 16, 2013 9:04 pm

In the general rule, or sense.
to add Sodium Sulfite into developer, would it INCREASE or DECREASE the developing time?

Here is the math I need to figure out :)
my developing tank is 16oz.
pour Rodinal 1:36 @20C.
add 5.6g sodium sulfite
take how long to develop 3 different brand of film?
- Foma120 200 pull to 100
- Tmax120 400 pull to 200
- Ilford Hp5 400 pull to 200

I know i probably need to do some test roll, but i need some suggestion developing time from all you boffin.

Thankyou very much

Posts: 837
Joined: Thu Jan 19, 2006 9:49 am

Re: sulfite + developer

Postby Ornello » Mon Feb 18, 2013 9:55 am

I would not add sulfite to Rodinal. It's balanced as it is.

Sodium sulphite works best in low-alkalinity developers such as D-76 or D-23, which use borax as an accelerator (D-23 uses no accelerator).

Why do people keep wanting to mess with developers? They are compounded to have certain properties and not others. Rodinal uses potassium hydroxide as its accelerator. Adding sodium sulphite to it will not help anything.

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