Re: Chrome Alum Gelatin hardener

Clay
I have been using your method of gelatine/glyoxal siezing and have not
noticed any yellowing. Hey, I even use your paper. I have some siezed
papers sitting on my desk for weeks now. Some with Pd prints, some just
plain paper. They are fine. I wonder if there might be something in your
Pd processing that leaves a residue that reacts with your gelatine/glyoxal
mix to make it yellow.
Marek

> But you don't say whether you rinse the hardened paper before it dries.
> That is, harden for 5 (or however many minutes) and then rinse in fresh
> water before drying. I'm trying to figure out why it doesn't yellow for
> everybody.... and that might possibly be the variable. And since you say
> that having "run it through wet steps at least once" prevents it.... well,
> it's a thought.
>
> J.
>
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>
> Judy:
>
> No I haven't been rinsing the paper, because I have been using the one
> step
> hardener-in-the-gelatin sizing routine. I am brush or rod sizing the pd
> print,
> and then letting it dry on a screen.
>
> So it may well be a procedural difference that is introducing the effect.
> One
> thing to keep in mind is that I notice this yellowing more because I
> typically
> do not size all the way to the edge of the paper. So could it be that
> maybe it
> isn't being noticed in some instances because the entire paper is sized
> and
> there is no unadulterated paper with which to allow a comparison? ( as
> would
> be true in the case of tray sizing)
>
> On a second note, I googled glutaraldehyde, and the first two pages were
> health warnings and MSDS information about possible side effects from
> exposure
> to this chemical. These effects sounded awfully similar to those of
> formaldehyde. Is there any other inherent advantage other than the ones
> mentioned. (I guess this part is directed at Ryuji)
>
>
>
> Clay
>
>
> But you don't say whether you rinse the hardened paper before it dries.
> That is, harden for 5 (or however many minutes) and then rinse in fresh
> water before drying. I'm trying to figure out why it doesn't yellow for
> everybody.... and that might possibly be the variable. And since you say
> that having "run it through wet steps at least once" prevents it.... well,
> it's a thought.
>
> J.
>
>
>
Received on Tue Feb 10 10:08:26 2004