water-fast
[ waw-ter-fast, -fahst, wot-er- ]
/ ˈwɔ tərˌfæst, -ˌfɑst, ˈwɒt ər- /
adjective
(of a color or dye) resistant to the effects caused by water; not changed or faded by the action of water.
Origin of water-fast
First recorded in 1540–50