Q: I have read that damar varnish can be diluted to make
retouch varnish. What would I dilute it with, and what is the correct
ratio?
A: Gum turpentine is the solvent of choice for dammar
varnish. For retouch varnish you should thin it down with 10 parts
solution to one part varnish.
--by Camille LaPointe-Lyons