RE: Glyoxal?

Was this a open tray situation or you were brush coating? I used to add
formalin as mold-preventer to my Cyanotype A soln. (classic cyanotype)
"indoors". I was drawing about 5ml formalin from it's bottle with a
pipette and add it to the freshly mixed 1lt A solution sitting on a wide
mouth glass container then mixing it vigorously. I never noticed any
odor (I don't know if people have different formaldehyde-sensing levels)
or experienced eye-burning doing this. That's why I'm asking insistently
if you were hardening in an open tray...

Regards,
Loris.

-----Original Message-----
From: Dave Rose [mailto:cactuscowboy@bresnan.net]
Sent: 16 Ocak 2006 Pazartesi 16:43
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Glyoxal?

Formalin is very nasty stuff. If you use it indoors, it releases fumes
into the air and your eyes will burn terribly. I tried it once, opened
all the windows and left the room until the paper was dry. I resumed
the task outdoors a few days later, and have done all hardening outside
ever since.

I've never seen formalin discolor paper. I've had nothing but good
results using it.

Dave in Wyoming

----- Original Message -----
From: "Yves Gauvreau" <gauvreau-yves@sympatico.ca>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, January 16, 2006 7:19 AM
Subject: Re: Glyoxal?

> Hi Dave et all,
>
> one thing (amoung many) that I don't understand, I found a paper on
gelatin
> where I read that both formalin and glut are use to harden gel capsule

> amoung other things. We eat this stuff all the time and yet
> manipulating
it
> is harzardous. From what I can figure out, when either hardener are
> use
such
> that all of it get cross linked it would seem that from then on it is
> no longer a healt hazard. If this interpretation is correct, would
> this mean that all we need to do is to find the proper concentration
> needed to cross link the gelatin properly for our purpose and with
> proper care and safety, after that we should be ok???
>
> I read in this paper that we can cook gelatine at around 500 F and
> this causes polymerisation could this be useful???
>
> I have a few more question on this, one is about the color, I'd like
> to
know
> amoung the various hardener we can use which (if any) would be
colorless???
>
> What about permanance, is there one of these that is more "permanent"
> then the others???
>
> Are there some process that are sensitive to sizing in terms of
> quantity
> (thickness) RH and PH???
>
> Thanks
> Yves
>
>
> ----- Original Message -----
> From: "Dave Rose" <cactuscowboy@bresnan.net>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Monday, January 16, 2006 8:58 AM
> Subject: Re: Glyoxal?
>
>
> > No. I would never use formalin indoors, even in very small amounts.

> > As long as it's above freezing and the wind isn't blowing too hard,
> > plan to harden your paper outside.
> >
> > Dave in Wyoming
> >
> > ----- Original Message -----
> > From: "Loris Medici" <loris.medici@altinyildiz.com.tr>
> > To: <alt-photo-process-l@sask.usask.ca>
> > Sent: Monday, January 16, 2006 4:59 AM
> > Subject: RE: Glyoxal?
> >
> >
> > > Hi all,
> > >
> > > I presume "took it outside" suggestion is when you harden in
> > > trays. I assume it would be safe to use formalin indoors when
> > > using a very
small
> > > amnt. - such as brush sizing. (Think of 100ml %3 gelatin solution
> > > + 1.5ml formalin) Am I correct here?
> > >
> > > TIA,
> > > Loris.
> > >
> > > -----Original Message-----
> > > From: Judy Seigel [mailto:jseigel@panix.com]
> > > Sent: 14 Ocak 2006 Cumartesi 05:32
> > > To: alt-photo-process-l@sask.usask.ca
> > > Subject: Re: Glyoxal?
> > >
> > >
> > >
> > >
> > > On Fri, 13 Jan 2006, Christina Z. Anderson wrote:
> > >
> > > > Personally, if I wasn't using glut I would go to formalin before

> > > > glyoxal. It's worked for centuries--well, 1 1/2 centuries.
> > >
> > >
> > > Where do you get formalin, Chris? In NYC you need a doctor's
> > > prescription, or maybe a mortician in the family. I can get the
former,
> > >
> > > if not the latter, but don't because I find it so painful to use
indoors
> > > &
> > > don't like outdoors in winter. Plus, as I've said probably too
> > > many times, glyoxal cleared better (for me, anyway).
> > >
> > >
> > > J.
> > >
> >
>
>
Received on Mon Jan 16 09:04:11 2006