Re: Yellow pigments and Gum problem(s)

Marek

Thanks for this idea!

Your comment made me do a rescan of the Stouffer and use the
level-adjustment in Photoshop
to maximize - and yes!! now I see it the gradations are there - so I think
you are very right - they are very hard to see.

Roman, Denmark

.

----- Original Message -----
From: "Marek Matusz" <marekmatusz@hotmail.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, November 24, 2005 5:10 AM
Subject: Re: Yellow pigments and Gum problem(s)

> Roman,
> Would it help if you prined your yellow on top of a light blue insted of
> white. Light yellow over white could be difficult to see the gradations.
> Marek, Houston
>
>
>>From: Katharine Thayer <kthayer@pacifier.com>
>>Reply-To: alt-photo-process-l@sask.usask.ca
>>To: alt-photo-process-l@sask.usask.ca
>>Subject: Re: Yellow pigments and Gum problem(s)
>>Date: Wed, 23 Nov 2005 20:02:08 -0800
>>
>>
>>On Nov 23, 2005, at 2:58 PM, roman sokoler wrote:
>>
>>>Dear List
>>>
>>>I use Yellow (Schmincke PY154) ,
>>
>>Hi roman,
>>Actually this pigment (benzimadazolone H3G, PY154) was also on Juan
>>Miguel's list of possible yellows from the other day, as Winsor & Newton
>>"Winsor Yellow" and I forgot to comment on it then. I've never used this
>>pigment, but from its description as a "light to very light valued yellow"
>>I wonder if it has the tonal depth to print the range of tones that a
>>darker-valued yellow might (it wouldn't have to be a deep yellow, just a
>>mid yellow would work fine). But then your statement that it has the
>>density you desire seems to contradict that idea. If you're saying that
>>the 7 indistinguishable steps are of sufficient density, then that would
>>seem to indicate a different problem (overexposure, perhaps?) than if the
>>7 indistinguishable steps are very light in value, which would seem to
>>indicate that the pigment itself is just too light (I'm assuming you've
>>already ruled out simple things like underexposure and that you're mixing
>>the pigment at its maximum strength). This is another case where it would
>>be ever so much easier to advise iif one could actually see the thing
>>rather than trying to guess from a description.
>>
>>But this is starting to sound very much like a discussion from last year.
>>If you'll look in the archives for June, 2004, and find a thread called
>>"Gum Tricolor Yellow" you'll find a discussion that started out by
>>someone asking the very same question, (about a different yellow pigment,
>>PY138) The question brought out a lot of good discussion and I think
>>probably many of the same comments would apply here. So I'd start by
>>reading that discussion.
>>
>>>Phthalo Blue (Sennelier PB15) and Quinacridone Red (Sennelier PR122)
>>>pigments for tricolor gum printing.
>>
>>The only Sennelier paint McEvoy lists under PR 122 is called, according to
>>his listing, "quinacridone purple." The color index name for PR 122, in
>>other words the proper name for the pigment, is Quinacridone Magenta. I
>>can't find my Page or Wilcox to check the Sennelier listing, so I guess
>>I'll just have to be puzzled about this "quinacridone red" designation. I
>>personally believe PR 122's reflectance curve, with a significant peak in
>>blue, doesn't make it a good magenta for tricolor, but it also depends
>>no doubt on what the other two colors are, as well as on infinite other
>>manner of things. Do you find that this pigment works well for you?
>>
>>Katharine Thayer
>>
>
>
>
Received on Thu Nov 24 02:02:35 2005