U of S | Mailing List Archive | alt-photo-process-l | RE: Glossy Kallitypes

RE: Glossy Kallitypes

Overexposure may be caused by using too little sensitizer -> probably
the glossy superhardened s/g paper(s) you use don't absorb enough
sensitizer, and in the end you remain with a *very thin* sensitized
gelatine layer -> which accordingly gets overexposed very quickly.

You may try to use a non superhardened paper and/or try to increase the
swelling properties of the gelatine (I'm not sure how)...


-----Original Message-----
From: dhowk [mailto:dhowk@comcast.net] 
Sent: Tuesday, May 29, 2007 12:18 AM
To: alt-photo-process-l@usask.ca
Subject: Re: Glossy Kallitypes

I don't have a transmission densitometer; but am thinking of trying  
something like in BTZS book with my spot-meter. In mean time,  I'm  
testing with same negative & same exposure, etc.  for Kallitype on  
COT-320, Arches Platine and on fixed photo paper; and the results   
are entirely different with solarization in shadows & border for the  
photo paper. I could reduce exposure for photo paper but risk losing  
detail in the highlights.
Doug Howk

On May 28, 2007, at 4:48 PM, Sandy King wrote:

> Doug
> Solarization is normally caused by over-exposure in the shadows. Do
> you have any means of measuring the density of your negatives? If  
> so, what is Dmin (shadow density) and Dmax (maximum shadow density)?
> Sandy
> At 4:38 PM -0400 5/28/07, dhowk wrote:
>> I've experimented with Kallitypes on glossy or semi-glossy paper,
>> but have solarization problem. With COT-320 & other watercolor  
>> papers, gold-toning before fixing seems to control solarization,  
>> but not on glossy paper. I've been using Sodium Acetate or Sodium  
>> Citrate as developers with tartaric acid & Potassium Dichromate as  
>> additives.
>> For the paper, I've tried fixed photo papers including Bromoprint  
>> & Oriental Seagull graded. Following Dick Stevens' advice in his  
>> book, I've tried varying the silver to iron ratio in sensitizer  
>> with as high as 3:1 for Silver Nitrate to Ferric Oxalate. This  
>> does seem to give some control, but does not totally eliminate the  
>> solarization. Am I missing something or is it not possible to do  
>> good Kallitypes on glossy paper?
>> Thanks,
>> Doug Howk