Re: Glyoxal?

All,
I would add even one more factor to this glyoxal issue and gum observations
in general. Most of the observations are not made with scientific
instruments, where the readings are objective from place to place. They are
made by looking at, feelingt the samples, etc, very objective tests in their
nature. For example what Katharine might call a non-yellowing glyoxal siezed
paper might be a slight yellow tint to Chris. When I first used glyoxa /
gelatine mix I decided I got no yellow stain, later I changed my mind and
said that slight yellow stain was observed. I rinse my papers the day after
they are sized, which keeps tha papers white and pre-shrinks them at the
same time. I am still experimenting with the most conveniet way to sieze the
papers for gum.
I have been experimenting with gelatine/dichromate with quite good results.
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: Glyoxal?
>Date: Tue, 17 Jan 2006 08:01:44 -0800
>
>Yves,
>Like many of your ideas, it's a good idea, but not a new idea, and
>unfortunately not a very practical idea. In order to come up with
>generalizable results, given the number of variables that would need to be
>controlled, for every question we would need hundreds of observations
>under scores of different conditions; the task is mind- boggling, even when
>the workload is shared, as you suggest. Since there are at most a handful
>of people who are interested in the larger questions and willing to engage
>in testing for the sake of testing, I just don't see how we could cover
>all the variables in order to get results that could be universally
>repeatable. The reason I recommend that people simply do their own tests
>to find out what works for them, is that this is truly the most effective,
>efficient way to get to making gum prints, not because I'm not interested
>in the larger questions. But as a statistician, I have to be realistic
>about the possibility of answering the larger questions in any meaningful,
>reliable, way, although I do keep chipping away at it as much as I can.
>
>This was before my time, but I seem to remember reading in the archives
>about a group testing of gums, where different people tested different
>gums in their own environments, and got different answers as to which were
>the best gums. Then they traded samples, so that they were each using
>exactly the same batch of gum as the other person was, and they still got
>different results, and decided the different results must be due to the
>different water in the different places. There are just too many
>uncontrolled variables to be able to come up with repeatable answers. It's
>not that it hasn't been tried, it's just that it's not as easy as it
>seems.
>
>Glyoxal has been used successfully by many gum printers without any
>yellowing problem, and though yellowing has been observed by some, most
>who have observed it have found that rinsing the paper eliminates the
>problem. Chris is the only one I know of who has reported that rinsing
>doesn't eliminate the yellowing, although she reports knowing of others.
>Even if you came up with some kind of universal answer, which I'm very
>skeptical about, people would still make their choices based on personal
>preference. I prefer glyoxal, (although when it comes to personal
>preference, I really prefer a mixture of gelatin and gesso, that's my very
>favorite size. But I don't like cleaning the gesso out of the measuring
>cup; it's really a messy job. Maybe if I learned to mix the sizing in a
>cottage cheese container or something, I could use this sizing all the
>time, and just throw away the container each time). But at any rate,
>glyoxal really works quite well for me, as you can see from my tricolors
>for example, see enlarged detail here:
>
>http://www.pacifier.com/~kthayer/html/optrans.html
>
>The graininess in the left picture is a function of the pigments, not the
>sizing. With glyoxal, I get a smooth paper, none of the grittiness that
>Chris reports, white whites, and a fine print. From the popularity of
>glyoxal over the last few years, I would be quite surprised if I'm the
>only one who finds it a fine size.
>Katharine
>
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>On Jan 16, 2006, at 8:45 PM, Yves Gauvreau wrote:
>
>>Hi again,
>>
>>this is just an idea that came to me after reading Judy and Christina.
>>There
>>are so many variables at play in each part of any process that it is
>>basically certain that our experiments aren't repeatable by other most of
>>the time if not always. I'm not saying that with the intention of being
>>rude
>>to anyone on this list but I'm convinced that most of the time most
>>experiments are mostly useful to the one who did them and most probably
>>useless most of the time to others. I think it would save all us a great
>>deal of time if we didn't have to repeat all experiments on our own all
>>the
>>time because most of you I'm sure already know that others experiments
>>have
>>proven themselves not very useful so many time in the past and know you
>>do
>>your own.
>>
>>That doesn't have to be the case or at least we could try to improve the
>>usefulness of our tests probably both for ourselves and to others. I
>>don't
>>pretend to have a clear and definite answer to all this but I'd surely
>>like
>>to try finding a better way. I would go further then that, we could also
>>devise some scheme to split the workload. Before that, I think we should
>>address the first problematic and I think a potential avenue of solution
>>would be to agree on some form of standardisation but as I said earlier I
>>don't care who comes up with (a)the solution or what it is as long as we
>>all
>>agree on something and that it works.
>>
>>I just hope this doesn't sound to awful,
>>Yves
>>
>>
>>
>>----- Original Message -----
>>From: "Judy Seigel" <jseigel@panix.com>
>>To: <alt-photo-process-l@sask.usask.ca>
>>Sent: Monday, January 16, 2006 9:10 PM
>>Subject: Re: Glyoxal?
>>
>>
>>
>>>
>>>On Mon, 16 Jan 2006, Christina Z. Anderson wrote:
>>>
>>>>Your tests prove that glyoxal does yellow, but not always. My tests
>>>>
>>prove
>>
>>>>that glyoxal does yellow, too, but in degrees. I would therefore hope
>>>>
>>that
>>
>>>>our tests that we have spent so much time on are worthwhile to
>>>>ourselves
>>>>personally and to others on this list. How else would we develop a
>>>>
>>database
>>
>>>
>>>(etc.)
>>>
>>>Before we abandon the principle of cause & effect, a suggestion:
>>>
>>>I found that every alkali I tested turned glyoxal yellow or orange
>>>sooner
>>>or later, very or somewhat. And we know that MOST (if not all)
>>>contemporary art papers are buffered, that is, stoked with alkali to
>>>counter the acid effects of air, or rain, or water, or more probably the
>>>nasty chemicals used in making the paper or the water the factory uses.
>>>
>>>So it could be the paper buffering that causes the yellowing. Why don't
>>>all art papers yellow all the time in glyoxal? Possibly the water
>>>supply.
>>>Most of us use tapwater from different sources -- so they're different.
>>>There's also the "pump house" where civil servants add different
>>>ingredients according to season and weather, needs of the moment &
>>>theories of the state legislature.... So our summer water may be
>>>different
>>>from our winter water, etc. etc. etc.
>>>
>>>Should a day come when I have time for more tests, I'd use the pH pen to
>>>test pH of paper, and then test pH of the water. We do know that some
>>>water sources are very alkaline (they can bleach your cyano overnight).
>>>That might also yellow your unrinsed glyoxal paper. But some water might
>>>be relatively acid, & counter that tendency of glyoxal. I'd also test
>>>tap
>>>water for development versus distilled for both mixing and developing...
>>>which might also shed light. Or dark.
>>>
>>>Plus art papers vary batch to batch & by the season they're made -- I'm
>>>told that's because the water they're processed in changes... Friend
>>>told
>>>me some of his paper customers only buy paper (for platinum) made in, I
>>>think it was winter, but we don't know when the paper we buy from Sam's
>>>art store, or online, or find in a drawer was made.
>>>
>>>The only trouble with this theory of course is that some of us watching
>>>this have found our STUDIO is consistent, even as the seasons change. I
>>>have no theory for that.
>>>
>>>Judy
>>>
>>
>>
>
Received on Tue Jan 17 10:57:30 2006