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)... Regards, Loris. -----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 Sandy, 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. Thanks, 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 >
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