U of S | Mailing List Archive | alt-photo-process-l | RE: archivalness of gum

RE: archivalness of gum



Oh, please don't say thanks because now I am feeling embarrassed. We are all
posting here and having fun, aren't we?  :-)

Happy Holidays to you too and to all of you on the list!


Dave  

> -----Original Message-----
> From: Yves Gauvreau [mailto:gauvreau-yves@cgocable.ca] 
> Sent: Friday, December 21, 2007 1:08 PM
> To: alt-photo-process-l@usask.ca
> Subject: Re: archivalness of gum
> 
> Dave,
> 
> Thanks for the clarification and your time.
> 
> Happy Holidays
> Yves
> 
> ----- Original Message -----
> From: "Dave S" <fotodave@dsoemarko.us>
> To: <alt-photo-process-l@usask.ca>
> Sent: Friday, December 21, 2007 12:53 PM
> Subject: RE: archivalness of gum
> 
> 
> > I just noticed that you didn't say specifically gum, but it is the 
> > same
> that
> > many paintings of old times (consider Chinese paintings, 
> for example) 
> > use animal glue, which is a form of gelatin. The glue was 
> not purified 
> > like we can today, but still they last.
> >
> > When you look at those old paintings, usually the problem 
> is that some 
> > of the pigments fade (for example, indigo from indigo plant rather 
> > than Prussian blue which didn't exist at that time, or true gamboge 
> > from rattan trees), or the paper itself became yellow and crispy 
> > (because of the
> acidic
> > content), but the pigment remain fixed on the paper by the 
> gum/gelatin.
> >
> >
> > Dave
> >
> > > -----Original Message-----
> > > From: Dave S [mailto:fotodave@dsoemarko.us]
> > > Sent: Friday, December 21, 2007 12:47 PM
> > > To: 'alt-photo-process-l@usask.ca'
> > > Subject: RE: archivalness of gum
> > >
> > > Yes, but since gum arabic has been used in painting, the 
> > > archivalness of it has gone through time test for a long 
> time, from 
> > > hundreds to thousands of years.
> > >
> > >
> > > Dave
> > >
> > > > -----Original Message-----
> > > > From: Yves Gauvreau [mailto:gauvreau-yves@cgocable.ca]
> > > > Sent: Friday, December 21, 2007 12:13 PM
> > > > To: alt-photo-process-l@usask.ca
> > > > Subject: Re: archivalness of gum
> > > >
> > > > Hi,
> > > >
> > > > Out of curiosity, wouldn't it be appropriate to also 
> consider the 
> > > > gelatin and/or whatever else is used with the pigment(s) in the 
> > > > archivalness equation?
> > > >
> > > > Yves
> > > >
> > >
> >
> >
> 
> 
>