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

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:


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)?


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?
Doug Howk