Re: gum arabic
Maybe, but they're also talking about darkening (cracking is another issue) and that's my actual concern -> can it happen to hardened gum also? Anyway, we know that gum prints are stable for at least 120 - 130 years (by looking to the condition of actual prints made in the late 19th century), which is fine. But the image on the page is around 2-2.5 times older than the oldest gum dichromate print we can inspect... Regards, Loris. 30 Ocak 2009, Cuma, 10:57 pm tarihinde, Katharine Thayer yazmış: >> Loris wrote: >> >> I'm not that much confident since I had read this: >> http://www.history.org/foundation/journal/Winter01-02/bird.cfm >> >> What do you (all) think? > > Loris, I think it's unfortunate that they used unhardened gum as a > varnish; soluble gum is extremely likely to crack, as it did in that > instance, as well as being totally water soluble. (In this case the > water solubility was a blessing, because it made it easy to > remove). This isn't relevant to our use of gum arabic where the gum > that remains in the artwork is not water soluble and doesn't have the > same properties of being susceptible to cracking, so I'd say you > shouldn't let that account shake your confidence in the archivality > of a gum print. > Katharine
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