Re: I'll never double coat cyano again -- was what I've learned about cyanotype thru PDN

From: roman sokoler ^lt;[email protected]>
Date: 06/07/05-08:06:40 AM Z
Message-id: <001101c56b6a$21a05bf0$1701a8c0@sokolerskomp>

Chris

I don't think you should mix the steps on the 21-Stouffer with the 21 steps
on your calibrated PDN.

For the test Charles have done I still think he need to find the SPT (
standard printing time) for both the single and double coated cyano.

If he printed with this ( what I think : prolonged time) he would then see a
longer tonal range on the Stouffer.

Roman

by the way - in Post Factory Photography issue #5 - a lot of testing is done
with single and double coating. Here Cor Breukel says " a dramatic boost in
print density" with double coating - also my exerience.

----- Original Message -----
From: "Christina Z. Anderson" <zphoto@bellsouth.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, June 07, 2005 3:29 PM
Subject: Re: I'll never double coat cyano again -- was what I've learned
about cyanotype thru PDN

> Roman (and Charles et al),
>
> Three questions: is cyanotype ultimately only capable of 5-6 stops? And,
> if you double coat, how much more time do you need for exposure generally?
> And have you single or double coated with 2A:1B and how is that?
>
> What is fascinating to me about the PDN system is on the tonal palette
> that you get on the disk, the square 101 step one, on one side of it there
> is a step wedge and on another there is a step gradient. Therefore, every
> time you print your tonal palette (that you have colorized with the color
> you have chosen for the process and paper) you can check by those mini
> step wedges how many tones you can get with your "digital" step wedge, if
> you will.
>
> On Arches Platine, I get, with the color I have chosen, 11 steps on that
> wedge of different tones **before** applying a curve. After applying the
> curve, I get 21 steps of different tones.
>
> I'm only using a 6 minute exposure time under UV for that on Arches
> Platine. I am wondering if Charles' problem is his paper being not only
> slower but higher contrast as well. Ohhh, tho, I use 2A:1B so it is
> faster, maybe. I'm tellin' ya, Charles, go buy some Platine. I got
> another woman offlist to switch her testing to Platine and both of us feel
> we have died and gone to heaven with that paper. Except for its price.
> But at least it is not as bad as Buxton which is my next testing paper.
> Anyway, it produces deep, rich thalo blues.
> Chris
>
>> You have done a very nice work.
>> I just don't agree with your conclusions. From your scanned 6 pairs I
>> think you can see that double coat gives you higher Dmax and less
>> sensitivity (longer exposure times!).
>> I think your Double 22 min still is underexposed.
>> I think for cyano your tonal range is to short - you should be able to
>> print at least 10 - 12 step.
>> please correct me if Im wrong!
>> Roman
>
>
Received on Tue Jun 7 08:07:01 2005

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