From: Breukel, C. (HKG) (C.Breukel@lumc.nl)
Date: 04/29/03-05:20:01 AM Z
Sandy,
> From: Sandy King [mailto:sanking@clemson.edu]
> Sent: Tuesday, April 29, 2003 5:47 AM
> Clay,
>
> I think there is about as much contrast control with kallitype as
> with Pt/Pd. Up to this point I have primarily used small additions of
> potassium dichromate directly to the sensitizer to control contrast,
.. so this is a different approach from your notes in the PF#8, were you
mention you add different amounts of 4% dichromate to the developer.
Are you still using the developer single-shot in small amounts?
Do you have perhaps a nice table , like the one in PF8, but now for the
amounts of dichromate in the oxalate/silver sensitiser?
Thank you in advance!
Best,
Cor
> and this worked very effectively without any apparent increase in
> grain until I reached the equivalent of about 20ml of a 4% potassium
> dichromate solution per liter of developer. More than that amount and
> printing speed dropped a lot, and grain increased significantly. With
> the potassium dichroamte the limits appear to be a DR of about 2.4
> down to about 1.2 with no loss of image quality.
...
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