U of S | Mailing List Archive | alt-photo-process-l | RE: First tricolor gum

RE: First tricolor gum



Paul,
Real Aureolin, PY40 is considered to be a fugitive pigment, but it is a very transparent yellow and so very attractive to gum printers. I actually never tested it and can not comment on the lightfastness from my own experience. I tested all my pigments for at least a year of sun exposure.
Try PY150, nickel azo yellow as a close substitute. A very intense (most likely most intense of all yellows), very lightfast and transparent yellow.  
Marek

Date: Thu, 2 Jul 2009 21:24:09 -0700
From: viapiano@pacbell.net
Subject: Re: First tricolor gum
To: alt-photo-process-l@usask.ca

Marek...
 
The Aureolin pigment number is PY40.
 
I also have New Gamboge PY153 to try...
 
Paul
----- Original Message -----
Sent: Thursday, July 02, 2009 5:59 PM
Subject: RE: First tricolor gum

Paul,
This is so amazing to watch the progress of the print. Hope you are learning and enjoying the process. The yellow layer made so much difference! Congratulations of not being afraid!
What is the pigment number for the Aureolin?
Marek
 

Date: Thu, 2 Jul 2009 15:25:31 -0700
From: viapiano@pacbell.net
Subject: Re: First tricolor gum
To: alt-photo-process-l@usask.ca

Today I added an Aureolin yellow exposure (which was pale, but present) and a heavier pigment mix of Prussian Blue.
 
 
You can clearly see the difference between the results from yesterday and today's added layer(s).
 
Thanks for all the suggestions...looking forward to trying some more soon...
 
Paul
 
 
 
----- Original Message -----
Sent: Thursday, July 02, 2009 11:20 AM
Subject: Re: First tricolor gum

The yellows I have here at home are Aureolin and New Gamboge, both Dan'l Smith pigments...
 
Maybe I'll try a yellow exposure followed by a final blue one on the print I posted.
 
Thanks all...
 
Paul
 
 
 
----- Original Message -----
Sent: Thursday, July 02, 2009 8:45 AM
Subject: RE: First tricolor gum

Paul,
Welcome to the gum community. The print is very nice. You got the sun exposure/development nicely worked out. FOr a tricolor get a nice intense yellow. A number of them have been sugested here. If you so desire you can print another blue layer just for the shadows (shorter exposure).
Marek
 

Date: Wed, 1 Jul 2009 17:55:17 -0700
From: viapiano@pacbell.net
Subject: First tricolor gum
To: alt-photo-process-l@usask.ca

OK, I tried a tricolor gum today with the intent of getting true color. Using 1:1 gum/dichromate ratios and sun exposures of 3 minutes and 30-60 minute development, I ended up with this:
 
 
My guess is that I'm not putting enough pigment in my mixes...especially the blue pigment.
 
I used Prussian Blue, Warm Sepia, and Anthraquinoid Red...all Daniel Smith watercolors.


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