Webster's Revised Unabridged Dictionary · 1913

Impurple

Impurple , transitive verb

[Prefix im- in + purple. Compare Empurple.]

To color or tinge with purple; to make red or reddish; to purple; as, a field impurpled with blood.
Impurpled with celestial roses, smiled. — Milton
The silken fleece impurpled for the loom. — Pope