[QUOTE=bringe;3337I paint mountainscapes, which by its nature uses a lot of pure white. I paint oil on canvas but I use palette knives so I need the paint to be elastic as the paint layers are thick. The trouble I am having is that after 6 months, the white areas are yellowing significantly. I have been using Georgian oil Titanium white. If I use Zinc, its too transparent and cracks with the amount of paint I need to use. Can anyone help? Do I need to mix the titanium white with anything to stop the discolouration? Will a retouching varnish followed by a UV satin varnish stop this problem or am I doomed to yellow snow...?[/QUOTE]
Zinc white is not much good in my opinion for anything else but for mixing.
I paint snow capped mountainscapes also and mine don't yellow.
Snow on a mountain top normally reflects (absorbs) being white, the color of the sky, (usually blue tinge).
I add a touch of blue to my snow, not so noticeable that it turns blue, just a touch. If the snow is in shadow, then a touch more blue, have you tried this?
Hope you overcome your problem.