[pure-silver] Re: Grain Size

The was an article in Photo Techniques by the inventors of Xtol where
they state that Xtol produces finer grain and more film speed than D-76.
The differences are small but consistent and measureable.

Jerry

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Friday, October 27, 2006 5:31 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Grain Size



----- Original Message ----- 
From: "titrisol" <titrisol@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, October 27, 2006 7:22 AM
Subject: [pure-silver] Re: Grain Size


> Sulfite is very good with Rodinal but I followed Pat
> Gainer's
> advice and added 4 g/l of sodium ascorbate instead.
> That makes the development faster so that 1+50+C times are 
> the
> 1+25 times.
> Graininess decreases, tonality is smooth and sharpness is
> not
> affected.
>
> I wonder if you could also add ascorbate to D76
>
   Xtol is essentially a D-76 type developer using Ascorbic 
acid and Phenidone in place of the Hydroquinone and Metol.
   There is no magic in Ascorbic acid. By itself it is not a 
very satisfactory developer but it is superadditive with 
both Metol and Phenidone in a way similar to Hydroquinone. 
The main advantage of Ascorbic acid is that it is 
environmentally friendly.  It can not be used as a 
substitute for Sulfite, the functions are different.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

========================================================================
=====================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you
subscribed,) and unsubscribe from there.
============================================================================================================To
 unsubscribe from this list, go to www.freelists.org and logon to your account 
(the same e-mail address and password you set-up when you subscribed,) and 
unsubscribe from there.

Other related posts: