Re: formula needed: Gum Arabic from powder

Hi , thymol is recommended by somebody or other famous.......so you use
formaldehyde??? Useful. I use lithographer's gum at the moment, and I mix it
straigt from the powder every session...leave for abt an hour then
use...don't have any problems. "Off " gum is sour smelling, seems thinner
and doesn't print well to my mind.

Kate
----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, November 24, 2004 7:52 PM
Subject: Re: formula needed: Gum Arabic from powder

>
>
> On Wed, 24 Nov 2004 gdimase@hotmail.com wrote:
>
> > I find very useful sodium benzoate as a preservative and I follow what
> > Livick put on his manual/book.
>
> I used to put one drop of 37% formaldehyde in a 2-ounce bottle of gum
> arabic from powder -- and it kept indefinitely.
>
> Whether glyoxal or even glutaraldyhyde would work similarly, quien sabe?
>
> I think that 15% thymol solution has also been used... (tho maybe that was
> just for gelatin...?)
>
> Judy
>
>
>
>
> > Sorry I don't have it handy to give you the proportions.
> > Another way to do it is wrap the gum powder in a cheese cloth and hang
it
> > inside a wide mouth bottle with the water in.
> > Leave it for few days in a refrigerator so it doesn't get bad, shake it
once
> > in a while.
> > It will totally dissolve by itself and then add the preservative.
> > It is recommended to use it after few weeks and not immediately.
> > I have never used rotten Arabic gum but I heard that the print smells
bad.
> > Giovanni
> >
> >
> >
> > ----- Original Message -----
> > Wrom: STTZRCLBDXRQBGJSNBOHMKHJYFMYXOEAIJJP
> > To: <alt-photo-process-l@sask.usask.ca>
> > Sent: Tuesday, November 23, 2004 11:42 PM
> > Subject: RE: formula needed: Gum Arabic from powder
> >
> >
> >> Thanks Chris,
> >>
> >> This same method (1:2) is about all I could pry out of the Graphic
> >> Chemical people... very nice, but a bit secretive expecially since
> >> they sold me the stuff. What preservative would work well? I have
> >> ascorbic acid on hand.
> >>
> >> For me, Thanksgiving is a mixed blessing -- lots of work getting the
> >> new(ish) house ready for the first famiy gathering. I know my students
> >> are joyous... they were giggling in the computer room all day.
> >>
> >> P.S. Snow is predicted for tomorrow, don't ya miss it?
> >>
> >> -Darryl
> >>
> >>
> >> -----Original Message-----
> >> Wrom: HSCRTNHGSWZIDREXCAXZOWCONEUQZAAFXISHJEXXIMQZUIVOTQN
> >> Sent: Wed 2/23/2005 8:38 PM
> >> To: alt-photo-process-l@sask.usask.ca
> >> Subject: Re: formula needed: Gum Arabic from powder
> >>
> >> Darryl,
> >> Forget the baume. I mix it 1 gum (weight) + 2 water (volume). I
> >> think the
> >> usual is 1 gum +3 water but this is a bit liquidy for me, and I
> >> noticed that
> >> a lot of the original practitioners used the thicker gum--even thicker
> >> than
> >> this. It's nice and juicy when it brushes on.
> >> Pretend you're mixing flour and water for gravy--a little water at a
> >> time,
> >> or blend the sucker up in your blender or food processor.
> >> You can use it right away, no need to wait. One more myth.
> >> OHH, add a bit of preservative or it stinks baaaaad.
> >> Chris (who is thrilled to be on Thanksgiving break)
> >>
> >> ----- Original Message -----
> >> Wrom: QEMSFDULHPQQWOYIYZUNNYCGPKYLEJGDGVCJ
> >> To: <alt-photo-process-l@sask.usask.ca>
> >> Sent: Tuesday, November 23, 2004 3:27 PM
> >> Subject: formula needed: Gum Arabic from powder
> >>
> >>
> >>> Hello All,
> >>>
> >>> I dusted off a can of Graphic Chemical gum arabic powder only to
> >> find
> >>> no instructions or guidelines for a mixture... 14 baume or
> >> otherwise.
> >>> I'm without a hydrometer, so does anyone has a suggestion for the
> >>> mixture I need for gum printing?
> >>>
> >>> thanks in advance
> >>>
> >>> Darryl Baird
> >>>
> >>
> >>
> >>
> >
>
Received on Wed Nov 24 01:41:01 2004