[Alt-photo] ziatype question

Bob Cornelis bob at colorfolio.com
Tue Jan 30 02:09:55 UTC 2018


Thanks for the feedback - I'm also struggling to get a good dmax from the
ziatypes. I'm getting in the 1.2-1.25 dmax range as opposed to roughly 1.35
on the same paper (hahnemuhle plat rag) with pt/pd. I'm trying to really
control the humidity of the room and the paper carefully but none of it
seems to move the dial much. Longer exposure times don't help.

Did you ever determine what variable(s) gave you better dmax results?


On Mon, Jan 29, 2018 at 1:34 PM, Robert Krawiec <robk64 at yahoo.com> wrote:

> Hi Bob,
> I've dabbled a little with ziatypes. I like the concept, but I've only
> rarely been able to get a really good dmax out of this process.
> I initially used some Polaroid 55 negatives to play around and decided
> that I liked the gold chloride with sodium tungsten effect (a nice
> brown-blue split), so I tailored my digital negatives to this mix. Ziatype
> is pretty tolerant so you can use other mixes and still get a decent print
> out, then use some of the other chemistry to bump or reduce contrast. Last
> resort for me is creating a new curve for my digital negs (I use
> piezography inks, for me the simplest method out there).
> Good luck!
> Rob
> On Saturday, January 27, 2018 9:37 AM, Bob Cornelis via
> Alt-photo-process-list <alt-photo-process-list at lists.altphotolist.org>
> wrote:
> Hi Group!
> I'm about to embark on some initial ziatype testing and am curious about
> something I have not seen addressed in the materials I have.
> Since Ziatype allows for modifications to tone and contrast with the use of
> different chemicals (replacing the palladium component with things like
> gold chloride, sodium tungsten, etc), to what degree will this change
> exposure times and/or custom curves created?
> It would seem impractical to have to start over with calibration every time
> you tweak a few drops of chemistry here or there, but it also seems that
> particularly if you are affecting contract at least new custom curve might
> be needed.
> Any practical advice about how to approach this? CJames has a nice chart
> showing a number of chem combinations and their affect on tone and
> contrast. Would it make sense to only recalibrate if you are adjusting
> contrast? Would a new curve be sufficient or is a new exposure time needed
> also?
> Thanks!
> Bob
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