Etienne,
Any advantages of the monochromatic dye transfer over other traditional alt processes.
Marek
> Date: Wed, 4 Nov 2009 11:16:22 -0500
> From: photographeur@nerdshack.com
> Subject: Re: Dark reaction
> To: alt-photo-process-l@usask.ca
>
> Judy wrote:
>
> >your comment makes me think that there's really no such thing as
> >"fluorescent lights" -- but probably 10 different kinds (eg. black
> >light fluorescents, & some other kind my neighbor was using (as I
> >recall "blacklight blue"), plus plain vanilla "regular"
> >fluorescents, and probably every few years a change in "state of the
> >art" -- In my own experience, not only differences in the actual
> >colors of the light and the starters, but differences in the bulbs as well.
>
> True, but commercial fluorescents of all kinds start with a
> low-pressure mercury arc, which creates predominantly UV energy,
> which the phosphors on the inside of the envelope absorb and
> re-radiate at visible wavelengths. For blue-sensitive and
> orthochromatic (blue + green) materials, the actinic light from
> fluorescent lights is mostly the "leakage" UV -- the UV that is not
> absorbed by the phosphors -- rather than the visible light
> output. There is a fair amount of this "leakage UV" from all
> fluorescents, although there is certainly some variation.
>
> >However I do know that gum really is so flexible that that level of
> >"fogging" could have been incorporated into our procedure... that
> >is, just a somewhat longer soak. (We coated by the fluorescent
> >light but had a drying closet with only a red safe light.)
>
> I concur.
>
> >What "dichromated gelatine" process do you use Etienne? What's it
> >called for short?
>
> The carbon process and gelatin-based oil printing are the two most
> well-known. I have also done direct carbon, coating a more or less
> standard carbon emulsion onto a grass or plastic substrate and
> exposing through the substrate, and a dichromate-based dye imbibition
> process similar to dye transfer (DT hardens the matrix-film gelatin
> with the reaction byproducts of the development of the silver image
> -- I've done it directly with dichromate).
>
> As long as I'm on the subject, anyone who wants knock-down gorgeous
> B&W images (not just B&W -- monochrome of any hue) in the tradition
> of the best non-alt processes may want to try single-color
> dye-transfer printing. It was a well-kept secret back in the heyday
> of DT (which was most commonly used to make stunning color
> prints). Jim Browning of Digital Mask is (or at least was, a few
> years ago) supplying the necessary materials to practice the
> process. Or, you can make your own according to his most excellent
> instructions:
>
> http://www.dyetransfer.org/images/DyeTran.pdf
>
> The gelatin-dichromate dye imbibition process obviates the need for
> matrix film and hardening developer, but the mordanted final
> substrate and the dyes are still required.
>
> Best regards,
>
> etienne
>
>
>
>
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