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Tom,
Stand oil is much less yellowing than cold pressed linseed oil. The yellowing in linseed oils is a temporary condition which can be resolved by exposure to daylight.
Most yellowing in paintings is caused by using resins as an ingrediant in your medium or as a final varnish, such as damar. This yellowing, however, is not reversable, although the final varnish can be removed.
Gamvar is a great substitute as a final varnish. I add two teaspoons of Gamblin wax medium to the contents to make it a little less glossy.
Although I use a little Gamsol (thinner) with my medium (stand+cp linseed oil) I've been using M Grahm & Co. cold pressed walnut oil to clean my brushes and I'm happy to report my brushes have never been happier.
I like having as little solvent present in my studio as possible.
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