Re: New platinum book & miscellaneous
nadeaul@nbnet.nb.ca
Sat, 10 Dec 1994 20:22:28 +0300
>I originally wrote:
>
>> >Finally, I use a dilute liquitex bath (after the print has dried). This
>> >bath doesn't really add any perceivable gloss, but it does nake the
>> >blacks richer, and therefore also seems to increase contrast slightly.
>> >As fine art painters feel that this material is "safe" to use (with
>> >regard to longevity, yellowing, etc.) on their paintings, I feel
>> >comfortable usinging it on my prints.
>>
>> Bad news: Liquitex and other brands of acrylic dispersion gels may not be
>> very permanent. Read on.
>>
>> "The discoloration can occur in any brand of acrylic media or gel, but is
>> most noticeable in the unpigmented gels, matte, and gloss media. It is the
>> result of a detrimental interaction between the support and the media"
>>
>> This, from p. 381 in James Hamm et al, "The discoloration of Acrylic
>> Dispersion Media", _Saving the Twentieth Century: The Conservation of
>> Modern Materials; Sauvegarder le XXe siecle: la conservation des materiaux
>> modernes_ Proceedings of a conference, Sept. 1991, Canadian Conservation
>> Institute, Ottawa, pp. 381-392.
>
>Was there any specific information regarding which specific types of
>"supports" had what type of "detrimental interaction"?
glass
linen
canvas
woven polyester
Masonite
6 different brands were tested. The article is in-depth with lots of
graphs. Among other stuff you have to worry about, besides the acrilic
resin itself, are residual (unpolymerized) monomer, surface active agent
(emulsifier), protective colloid (thickener), water-soluble initiator,
plasticizer, pH buffer, anti-foaming agent, coalescing agent, preservative,
drying retarder, freeze-thaw stabilizer, UV inhibitor, optical brightener,
matting agent, water, aleluia...
Luis Nadeau
>
>- David