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 > > > > > > > > > > > > > >
|