2 Metaphors for varnish

I then tried to remove the pigment which hid my figures; but the varnish was refractory, and, after a vain attempt, I finally cut the picture up and stuck it in the fire.

The varnish, or glare, which our Correspondent describes, was that charming effect which we are wont to admire here, on earth, in evening scenes, especially when they are lit up by the splendour of the setting sun; but which must be doubly enchanting when viewed from so great an altitude.

2 Metaphors for  varnish