Re: Stand Oil is Polymerized Oil

In Reply to: Stand Oil is Polymerized Oil posted by John on 09/04/00 at 8:39 PM:

Thanks for that, John. Yes, I was overlooking the cross-linking of the linoxin and, one would have to consider the modern product at least partially polymerized.

The old references are to black oils cooked in open pots or (in order to maintain light color whilst boiling) the addition of carbolic acid. The terms get further confused by the reference to "standing" and dopping the coagulated mucilage (that only happens to unboiled oils). The release of the mucilage occurs seasonally. In current production, the oil is maintained at a very low heat (just warm) and the mucilagenous matter settles out in a process called "casting foots." The goal is to produce an oil with a relatively high Acid Value (above 5.0) that is free from mucilage and vegetable glues. It is sold under the name Special Aged Oil and it is designed especially for grinding pigments (the high Acid Value makes for superior and consistent wetting of the pigment particles...the difference between smooth and gritty paint)

In modern terms, Stand Oil is the thickened oil that is exceptionally light-colored (unlike the badly darkening sun-thickened oils, stand oil is virtually non-yellowing) that dries to an enamel-like sheen. The oil that is allowed to "stand" is now called Special Aged Oil (sometimes it's called Varnish Oil because of its use by varnish makers). It's main use in commerce is to make finely ground printing inks.
 
A. A. Art. This Site designed and maintained by Alexei Antonov
Translation from Russian Copyright (c) 1999 Vladimir Pavlov.
Copyright (c) 1999 Alexei Antonov. All rights reserved.