a bit of knowledge is worse than none at all.

the originator asked if sulfite would increase speed. he/she hasn't
asked about effect on grain.

Rodinal already has sulfite, adding more would have only a minor
effect.

As far as I know, NITROGEN is used by some to fill tyres, not oxygen.
Because they try to avoid oxygen. Someone heard  bells ringing, but
did not know in which church.

otherwise yet again wasted bandwidth from someone with loud mouth and
insufficient knowledge.

<>UC wrote:
<>
<>>Adding sulphite to Rodinal is like putting pure oxygen in your
tires.
<>>Pointless and even counter-productive. Sulphite's in D-76 action is
<>>two-fold:
<>>
<>>1) To preserve the metol against oxidation
<>>2) To reduce the graininess by dissolving a bit of the grain edges.
<>>
<>>To the best of my knowledge, the sulphite's solvent effect occuirs
only
<>>at certain concentrations and at a certain ph, and there is no
reason
<>>to believe that Rodinal's active ingredient and ph are suitable for
<>>sulphite to act in the same way in a Rodinal solution as it does in
<>>D-76.
<>>
<>>The alkali is different
<>>The developing agent is different
<>>The ph is different
<>>The concentration is different
<>>
<>>If you want a fine-grain developer, don't use Rodinal at all. There
is
<>>no point whaetsoever to adding sulphite to Rodinal.
<>>
<>>
<>>Mike King wrote:
<>>  
<>>
<>>>Bill Pierce (a man for which I have a great deal of respect) used
to use a
<>>>sulfite solution to moderate the graininess of Rodinal with high
speed films
<>>>like Tri-X, I believe Pat Gainer (another chap for which I have
much
<>>>respect) has also done some research on this.  Neither one of them
uses the
<>>>word stupid when replying to honest questions.
<>>>
<>>>"UC" <uraniumcommittee@yahoo.com> wrote in message
<>>>news:1130258109.287287.196330@z14g2000cwz.googlegroups.com...
<>>>    
<>>>
<>>>>Do not add sulphite to Rodinal. It's stupid. The developer is
<>>>>formulated to work with plain water.
<>>>>
<>>>>
<>>>>mmmmark@gmail.com wrote:
<>>>>      
<>>>>
<>>>>>I'm going to use sodium sulfite for the first time soon and, if
I
<>>>>>understand correctly, sodium sulfite accelerates developing. So
I'm
<>>>>>curious to know how much I should shorten my developing time in
<>>>>>relation to this1?
<>>>>>I have a 5% solution of it mixed up and I plan to use Rodinal at
1:50
<>>>>>for a roll of APX 100. The packaged literature recommends doing
it at
<>>>>>20 degrees for 17 minutes, so with the SS what would it  then
be,
<>>>>>approximately?
<>>>>>        
<>>>>>
<>>
<>>  
<>>
<>My experiments some years ago comparing Rodinal with sulfite and  
<>Rodinal with ascorbate against plain Rodinal told me that with
<>ascorbate, the grain is finer than plain Rodinal and the resolution
is
<>better than either of the others. Development time in Rodinal 1+50+
4
<>grams/l of sodium ascorbate is about the same as for Rodinal 1+25.
These
<>comparisons were published in Photo Techniques in the article "Salt
to
<>Taste" which also showed some results of adding sodium chloride to
D-23.
<>