RE: Some Kallitype observations
According to the quotation below, he uses 5% KOX one-shot for cleaner prints. > ...These compare well with prints developed > side by side with Hall's developer and with 20% sodium citrate. At > 5%, the toxicity of KOX may not be much of an issue (Spinach is > loaded with oxalate!). Also, it permits one-shot use to yield > cleaner prints, something I found with Pt/Pds. I finally did some Kallitype tests (20% FO + 10% SN, 20% Sod.Cit. Developer) and I can say that I like it more than Argyrotype; it gives smooth tonal transitions, beatiful tones (and no grain) and it's quite a low contrast emulsion(a plus for someone who uses digital negatives), Dmax is impressive; it's very close to Dmax of my straight Ziatypes. I bet gold toning would give even deeper shadows! I like much the color it gives on Cot320. It's the process with the shortest standard printing time; only 2:30 minutes with my lightsource. Since I couldn't manage to get paper white (but I'm very close) with the PDN color density palette (Epson 1290 OEM inks on Ultrafine), I will try to put dichromate in the developer in order to slightly increase emulsion contrast. A) What amnt. of dichromate would you suggest? B) What if I add dichromate (or H-peroxide) to the sensitizer? Another interesting point is that: my usual Ziatype coating solution exhibit around 27 - 28 steps in the 31-step tablet tests, whereas kallitype exhibit around 24 - 25. Using the same printer / inks and media I can get paper white with Ziatype (despite being a longer scale process) but I can't get paper white Kallitype! Quite confusing. My take is: Ferric Oxalate is sensitive to more than one wavelenghts. Some experience with Cyanotype Rex - which use the same sensitizer - strengthens this impression. (I have fogging problems and quite bizzare H&D curve results with Cyanotype Rex.) What do you think? TIA, Loris. -----Original Message----- From: Sandy King [mailto:sanking@clemson.edu] Sent: 06 Eylül 2006 Çarşamba 05:54 To: alt-photo-process-l@usask.ca Subject: Re: Some Kallitype observations ... Are you using the 5% KOX as a one-shot solution? How does it compare in printing speed to 20% Na citrate?
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