From: Ole Tjugen (oftjugen@online.no)
Date: 07/23/03-10:24:37 PM Z
I have some "classic" recipes in a book from 1904 (E. Vogel: Tascenbuch der
Praktischen Photographie) which I can look up in a week or two. Don't know if
the dyes still exist, or indeed whether it's possible to find out their modern
names.
Ole Tjugen
>===== Original Message From alt-photo-process-l@skyway.usask.ca =====
>From: Scott Walker <walker@sympatico.ca>
>Subject: Bromo-iodide Silver Gelatin Emulsion as an Alternative process.
>Date: Wed, 23 Jul 2003 23:08:54 -0400
>
>> I am trying to reproduce a traditional panchromatic B+W emulsion
>> which I can apply to glass plates.
>
>Here's the deal: I'll work on dyes, and share the info, if you work on
>coating and drying in total darkness. I've been looking for dyes to
>sensitize for infrared, since I'd love to photograph infrared images
>on glass plates. Panchromatic images are abundant now...
>
>> My problem is that I cannot find any decent recipes
>> with sensitizer dyes to achieve panchromatic sensitivity. Does anyone have
>> references to either recipes or dyes and their use as sensitizers? Or how
>> about the recipe to the recently deleted Verichrome Pan?
>
>If you have crappy recipes, please share it with us.
>
>I have a pretty comprehensive references to modern sensitizing
>dyes. Some of them are available from laboratory supply companies,
>especially the ones that are also used outside of silver photography.
>
>Synthesis of those dyes are pretty difficult, requiring multiple
>stages of reactions and purifications. I'd rather find ones that are
>used at least for laser or other physics related research that can
>also be used for photography, and buy them (expensive).
>
>Are you currently making iodobromide emulsions? Do you care to share
>your formula and your sensitometric results? Using sensitizer adds
>another set of variables for speed, fog level, etc.
>
>By the way, I am running a silvergrain mailing list, which
>specifically discuss emulsion making, coating, and actual imaging
>using such materials, whether it is paper, plates, film, or whatever.
>
>--
>Ryuji Suzuki
>"I can't believe I'm here.
>People always say that I'm a long way from normal."
>(Bob Dylan, Normal, Illinois, 13 February 1999)
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