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 > > > > > > >
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