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 > > >
|