Re: Gum Tri-Color Yellow

Wow, thank for the testing :-)

Did you mean PR209 as in Rowney Quinacridone Red
#528 (your previous post said PV209)? If so, I can probably get a tube
of that locally for some testing next week.

On Sunday, June 27, 2004, at 12:10 PM, Katharine Thayer wrote:

> Well, this doesn't prove anything one way or another, but just out of
> curiosity this afternoon, (well okay, curiosity plus avoidance of
> another thing I didn't want to do) I printed a "tricolor" with PV19. I
> say "tricolor" because it wasn't done with separations, I just printed
> one negative three times. (I just wanted to do a little test print and
> I
> don't have any little test negatives in tricolor separations).
>
> I found I had three different versions of PV19, so I mixed all three
> with gum and chose the one that looked most like a true magenta. The
> others were (1) more rose-ish, (M. Graham "quinacridone rose") and (2)
> purple (M. Graham "quinacridone violet.") The one I chose was Daniel
> Smith "quinacridone red." (There's a good example of a paint being
> named
> after a different pigment than the pigment it contains.) I was
> surprised, with all three of the PV19s, how sort of wimpy the color
> was.
> I put quite a lot of pigment in all three before I decided it was
> never
> going to get any more saturated than it already was.
>
> I used the PY110 for yellow, and indanthrone (PB 60) for blue, since I
> thought the indanthrone would be closer to the depth and hue of the
> cyanotype than the blues than I normally use.
>
> The red and yellow printed well and looked good together, as Tom
> described. But when I put the blue on, what I got was a reddish brown
> overall tone. I put another layer of yellow on just in case there
> wasn't
> enough yellow, but it didn't change anything, just turned the brown
> slightly more orange. And just in case for some reason the blue wasn't
> holding its own, I added another, heavier layer of blue (it was almost
> black and very heavily pigmented), but the extra blue didn't turn the
> brown black, as I would have expected, but just gave the brown a sort
> of
> purplish hue.
>
> Like I say, this isn't definitive by any means, but makes me continue
> to
> wonder if, perhaps, there's something about PV19, or the combination of
> PV19 and PY110, that creates this brownish tone when added to blue.
>
> Katharine Thayer
>
>
>
>
>
>
> Katharine Thayer wrote:
>>
>> Tom,
>> The brownish tone still doesn't make sense to me, even as a function
>> of
>> curves or exposures. You may of course prove me completely wrong about
>> that and are welcome to do so.
>>
>> But to me it's more likely related to the quinacridone violet that
>> you're using for the magenta. I hate to keep recommending pigment
>> changes to you, but I'm inclined to think a quinacridone red (PV209)
>> would serve you better. I haven't used PV19 very much, but I have seen
>> brownish tones when it is mixed with different colors.
>>
>> Sam would know better, but I also wonder about how different reds and
>> yellows work with the cyanotype, if it's possible that you'd need
>> different red and yellow pigments with the cyanotype than what would
>> work best with one or another of the blue pigments.
>> Katharine
>
>
--------------
Tom Ferguson
http://www.ferguson-photo-design.com
Received on Sun Jun 27 20:30:45 2004