Yellow pigments and Gum problem(s)

From: roman sokoler ^lt;>
Date: 11/23/05-04:58:18 PM Z
Message-id: <002401c5f081$66989410$3001a8c0@sokolerskomp>

Dear List

I use Yellow (Schmincke PY154) , Phthalo Blue (Sennelier PB15) and
Quinacridone Red (Sennelier PR122) pigments for tricolor gum printing.

Until recent I have been using the same PDN calibration for all three
pigments - that is same negative color and curve - based on the cyan

>From Chris I got the the inspiration and energy and decided to calibrate
each color separately - and it was during this work I noticed
a phenomena that I have seen before but not given much thoughts.

When I use the yellow pigment I don't get clear and discrete steps on the
21-step Stouffer , I cannot recognize the borders between the steps.

The density is fine and I get something like 7 steps on the Stouffer which I
find OK.

When I make a test with the Cyan and Magenta I see perfect steps.

Has anyone here on the list seen the same - what maybe even know the reason
and possible consequences?

Is this yellow pigment bad for doing details and fine lines?


Roman Sokoler

----- Original Message -----
From: "davidhatton" <>
To: <>
Sent: Wednesday, November 23, 2005 6:54 PM
Subject: Re: Gum problem(s)

> Christina,
> Would it be true to say then that you size BEFORE your cyanotype layer ?
> David H
Received on Wed Nov 23 16:58:35 2005

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