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Sinking in of umbersApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2019-08-28 02:11:23 ... Most recent comment 2019-08-28 19:12:52
Oil Paint

​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

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Moderator Answer (brian baade)

[2019-08-28 12:45:31]

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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User Comment

[2019-08-28 19:12:52]

​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. 

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