Re: "speckling" v "staining " (was New Orleans/glut)

Now, I do have some paper sized with glyoxal-hardened *gum* that IS
gritty, but my experiments seem to suggest that it takes a lot less
glyoxal to harden gum to a crystalline state than is needed to harden
gelatin to that state (I haven't seen this crystallization in gelatin
myself with either .6% or 1% glyoxal).

Also, the glyoxal-hardened gum turns a deep ivory color within a day on
Arches Bright White if not rinsed, but again, the paper returns to pure
white in the water development after gum exposure, even printed months
later.
Katharine

Katharine Thayer wrote:
>
> Judy Seigel wrote:
> >
>
> >
> > And though I haven't compared it to glut, I suppose I'd know "grit" if I
> > met it. None yet.
> >
> > Possibly different sources, formulations, qualities, of glyoxal... or of
> > everything else ? Or maybe it's something else in your combo.
>
> Yesterday morning I pulled out every piece of glutaraldehyde-sized paper
> and every piece of glyoxal-sized paper from my flat file, mixed them all
> up and felt them with my eyes shut, trying to tell the difference by the
> feel. In *my* shop, there is no difference between the two in terms of
> perceived smoothness; there is simply no grit with either type of
> hardener. I felt them with my fingertips, with the inside of my wrist,
> with my face; by no means could I feel any grit on my glyoxal-sized
> papers. The Fabriano EW I would agree with Chris feels like a baby's
> bottom, sort of dimpled and soft, but the Arches Bright White is
> smoother; it's as smooth as Yupo when sized with glyoxal. I don't have
> either paper sized in glutaraldehyde, but it's hard to imagine that
> either sized in glutaraldehyde could be any smoother.
> Katharine
Received on Tue Sep 6 09:28:43 2005