also: バニッシュ · バーニッシュ
A transparent protective coating applied to wood, paintings, or other surfaces.
from English
このテーブルにはワニスが塗ってある。
This table is coated with varnish.
絵の表面にワニスをかけると
Applying varnish to the surface of a painting makes the colors more vivid.
Rare variant with long vowel.
Borrowed from English 'varnish'.