All the wine I've seen has been either dark red or translucent, and all the seas I've seen have been bluish or green. Was wine different in Ancient Greece, or was the sea different, or was it some kind of translation error, or what?
Though more can be said here, this post covers a misconception that the Ancient Greeks had no color for blue simply because Homer called the sea wine-dark.
A post by /u/XenophonTheAthenian discussing the Iliad also discusses it: