Re: Glyoxal?

Loris,

is your formalin the 37% solution? If it's not then this could be the reason
why you don't experience eye-burning.

Regards
Yves

----- Original Message -----
From: "Loris Medici" <loris.medici@altinyildiz.com.tr>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, January 16, 2006 9:59 AM
Subject: 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 09:16:47 2006