Increasing potassium hydroxide concentration in rodinol.greenspun.com : LUSENET : Large format photography : One Thread
Anyone try to increase the potassium hydroxide concentration in rodinol, and if any what where the results?
-- Altaf Shaikh (email@example.com), November 27, 2000
I'd expect it to make the concentrate stronger, but may cause problems with precipitates etc. Why do you want to do this?
-- John Hicks (firstname.lastname@example.org), November 27, 2000.
To see what would happen
-- Altaf Shaikh (email@example.com), November 28, 2000.
Take a look at firstname.lastname@example.org), November 28, 2000.
">Eeek! Left out a quote mark there. That should be:
Take a look at this page, which has some important precautions about potassium hydroxide, but doesn't say what its function is exactly in Rodinal.
-- David Goldfarb (email@example.com), November 28, 2000.
Potassium hydroxide is the alkaline agent in Rodinal. Increasing it will increase the activity of the developer, probably making it even more contrasty. I doubt you will see much difference from simply developing in Rodinal (1:25). My preference has always been to use Rodinal at higher dilutions such as 1:50 and 1:75, so I wouldn't bother with the hydroxide myself. But you never know until you try.
-- Ed Buffaloe (firstname.lastname@example.org), November 28, 2000.