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An underpainting need not have its darks as dark as the final desired effect. The darks will have more depth if the underlying paint is lighter, and the deepest foreground darks subsequently painted with transparent paints in the top layer.
I would not recommend retouch varnish or any medium containing water for resaturating dried layers for painting over. A very thin application of linseed oil to the area to be painted into will do better. Wipe off as much as will come off with a lint-free cloth before commencing to paint. Enough will remain to accomplish the desired purpose.
Virgil Elliott
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