noun
copal oil; copal varnish
A resin-based oil or varnish derived from copal, used in traditional painting, varnishing, and sometimes in incense.
この絵の具はコーパル油で溶いて使います。
This paint is used by thinning it with copal oil.
古い家具の修復にはコーパル油が使われることがある。
Copal varnish is sometimes used in restoring old furniture.