Re: Modified Zia formula


Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Fri, 07 May 1999 15:43:16 -0400


I seem to recall someone posting a question a few days ago concerning a
milky appearance of some Zia prints; this may help address that issue.

I tried out some Ziatype at an ambient 70 % humidity just for the
halibut and found some interesting results. On two of two occasions the
modified formula as posted earlier produced fine prints. Well low and
behold, the published formula produced prints with milky splotches on
them. These splotches certainly looked like the result of a weak
chemistry.

This certainly is consistent with my other observations, although I
don't know why it decided to manifest itself at the higher humidity.

As an aside: Since I have just built a new darkroom, knowing I would be
doing the Ziatype variation, I tried to employ some control over
humidity. I have two dehumidifiers and a sonic mister and a heat
exchanger working with the ventilation system. This seems to give some
control. Although when dryer weather rolls around I expect I will have
to add another mister. Part of the plan is haveing the air enter the
room near the heater, dehumidifiers, and mister (as far as can be from
the sink) and then leaving the room from pickups along the back of the
sink.

-- 
Jeffrey D. Mathias
http://home.att.net/~jeffrey.d.mathias/



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