Re: Gum and Photogravure, was: varnishes
I didn't say anything about oil paintings in general since the substrate is usually sealed before painting onto... (But nevertheless oil painting has its own problems in other areas - not that it doesn't own its own advantages in others.) About gum, the first thing that comes into my mind is the fact that there are whole bunch of *pretty old* watercolor paintings in museums / collections and such. Since the binder in watercolor paints consist of mostly gum arabic, I don't see any reason to be suspicious about it. Regards, Loris. 16 Kasım 2008, Pazar, 1:19 am tarihinde, Jon Lybrook yazmış: > I agree. Thanks Loris. And yes, the best oil-based etching inks are > made from linseed. > > I believe you are right about carbon, from what little I know about it, > but is there any evidence to support the idea that a gum print is more > stable than an oil painting (or oil-based photogravure print)? > > Thanks, > Jon > > Loris Medici wrote: >> 15 Kasım 2008, Cumartesi, 9:30 pm tarihinde, Jon Lybrook yazmış: >> >>> ... Oil based ink on cotton rag or alpha cellulose paper is essentially >>> pH neutral anyway, isn't it? ... >>> >> >> Shouldn't be if it's the same oil (linseed oil) they use in oil >> painting... But of course since it's a lot stiffer than regular oil >> paints >> it should have much less oil. Anyway, the oil (and acid) is still there. >> So, I wouldn't consider a photogravure print as archival as say a carbon >> or gum print made with non-fugitive pigments. But probably the >> comparison >> is moot - only a consideration for historians... >> >> Regards, >> Loris.
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