gold powder is generally 8 mesh. Of course, 12 mesh is brighter.
varnish mainly plays the role of adhesion.
thinners mainly dilute. Generally, it is sold in paint shops. I really can't buy it, so can gasoline.
when the three are mixed, the amount of gold powder is more, as long as the varnish can mix the gold powder evenly, then add the thinner, not more at a time, and slowly add it while mixing. Until you are satisfied.