Re: Those darn fish-eyes

To add to this - I've been watching for fish-eyes since this discussion
began - I get them, but because I use a roller to smooth off the coat, they
disappear entirely. I agree with Dave on this, another brushing will get rid
of them in most cases. I use gelatin at 45 deg C, the recommended
temperature for gelatine. I disagree with Dave on the heating processs tho,
cooks know ( Granny was a Home Ec teacher)that gelatin can stick and burn -
that's the reason for the water bath - also..........it shouldn't be
overheated as this breaks it down and reduces setting capacity (or so I have
always been told), and heating in a pot heats unevenly, causing the whole
boiling (lol) to become suspect.
Kate

----- Original Message -----
From: "Dave Rose" <cactuscowboy@bresnan.net>
To: "Alt List" <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, January 07, 2004 8:54 AM
Subject: Re: Those darn fish-eyes

> Yes, the gelatin should be hot. Your procedure is OK, although it's not
> necessary to keep the gelatin in cold water for "several hours" prior to
> heating it up. Fifteen minutes should be sufficient. It may be easier
and
> faster to directly heat the gelatin solution on the stove burner, rather
> than using a water bath.
>
> I sometimes see the "fish-eyes" when coating paper. Typically it will
> appear on the initial pass of the brush, but subsequent brush strokes will
> close it up and create a blemish-free coating.
>
> Dave in Wyoming
> -30F this morning!
>
> ----- Original Message -----
> From: "Gary Nored" <gnored@centurytel.net>
> To: "Alt List" <alt-photo-process-l@sask.usask.ca>
> Sent: Tuesday, January 06, 2004 8:38 AM
> Subject: Those darn fish-eyes
>
>
> > A gelatin sizing question appears at the bottom of this message.
> > Everything in between is just background ....
> >
> > I've thought for some time now that most of the gum-printing
> > problems I've encountered stem somehow from my gelatin sizing.
> > This weekend a friend tried to use some of my paper with his own
> > gum/pigment mixtures, and encountered the dreaded fish-eyes. I
> > take this as confirmation, of a sort, of my thinking.
> >
> > So now I'm re-examining my sizing process which is, more or less:
> >
> > 1. Add gelatin to cool water and let bloom several hours.
> > 2. Place gelatin in a 145 degree F hot water bath, and allow
> > temperatures to equalize.
> > 3. Place paper in the hot gelatin, soak, and remove, drawing the
> > paper through the wooden dowel thingy Dave Rose told me how to
> > make (thanks Dave!).
> > 4. Hang until dry.
> > 5. Repeat steps 3 and 4.
> >
> > My question is: should the gelatin be hot when I coat the paper?
> >
> > Regards,
> > Gary Nored
> > http://home.centurytel.net/Gary_Nored/
> >
>
>
>
>
Received on Wed Jan 7 14:55:22 2004