Re: Gum Tri-Color Yellow

Tom,
     Sam is the one to answer the cyano part of your question, although I do
print it
fully--if I don't, then I have to print another layer of blue on top of the
tricolor-not a bad thing.
     I never have to reprint yellow so it could be you need more yellow in
your mix, or, as Katharine says, the yellow is too light. If my images err
on the side of imbalance, they are too yellow.
     Good way to test is double the pigment in your yellow mix for the next
print, with all other variables the same, and see if that doesn't solve your
problem.
     When I coat on my yellow coat, it is Ronald McDonald Yellow on the
paper, even without dichromate. It looks horrible on top of the cyano layer,
and when exposed I have this ugly greeny yellow print that looks like it
won't resurrect, but then the magenta layer brings out all the colors
correctly.
Chris
----- Original Message -----
From: "Tom Ferguson" <tomf2468@pipeline.com>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Wednesday, June 02, 2004 8:00 PM
Subject: Gum Tri-Color Yellow

> As my new gum project progresses, I'd love some comments on the yellow
> layer of a tri-color gum. I'm basically trying Sam Wang's method
> (cyanotype, then yellow gum, then magenta gum from digital negs). see
> here:
>
> http://unblinkingeye.com/Articles/3CG/3cg.html
>
> First question: Yellow layer. The "Process" looking yellow paints are
> giving me a normal DR and clear well. What they don't do is show the
> individual steps well, I get more of a gradient than steps. I settled
> on Rowney's "Permanent Yellow #664" (Quinophthalone Yellow PY138). The
> image looks OK, but Yellow is always the color I have to reprint to get
> the balance right. Is this normal, or am I using a poor paint choice.
>
> Second question: Is anyone using the full "D-Max" of the cyanotype? I
> find it too strong for the gum layers, and have adjusted the curve and
> print time to limit the D-Max. Normal, or am I missing something?
>
> Thanks
>
> --------------
> Tom Ferguson
> http://www.ferguson-photo-design.com
>
Received on Thu Jun 3 10:11:09 2004