Hi,
just read your document on FAQ’s etc, in regard to sinking in of the umbers, apparently because of their clay content (PBr7 from natural iron oxide ore).
(1) I have just noted that W & N make a similar colour, synthetic iron oxide PR101 (transparent brown oxide) which has, apparently, micronised pigment particles which I doubt would contain any organic substances such as the problematic clay referred to above? If I use the latter should I then avoid the sinking in associated with PBr7? (all other things being equal);
(2) If I use an oil-based primed canvas such as lead white (instead of an acrylic gessoed one) would this stop the sinking in, even if I use PBr7?
Many thanks in advance
Brian,
thanks your response and taking the trouble to provide the relevant links. I read all of those and got a lot of additional information which has cleared up a number of issues.
Sinking-in has been discussed quite a bit on MITRA Please check out these threads:
https://www.artcons.udel.edu/mitra/forums/question?QID=291
https://www.artcons.udel.edu/mitra/forums/question?QID=46
The subject is well covered here as well:
http://www.justpaint.org/oiling-out-of-dead-colors-in-oil-paintings/
Which is also in our downloadable PDFs
The synthetic iron oxides do not contain clay and likely suffer less from sinking-in. They also handle differently.
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