NYT Connections Blue Group Hint

There’s your visual hint for today’s blue group. It might be your eureka! moment. (No, sorry, that was not a clue.) Or it might not have helped at all. Hey, we try.
Time for the verbal clue: We can’t swear to this, but these might be words you’d find in a box of Crayons. (One of the really big ones, because we’re getting pretty deep into the colorful nomenclature.)
No? Yeah, us too. This one was pretty unfair, especially before our morning coffee…
Today’s blue group answer is Shades of Black and its words are CHARCOAL, JET, RAVEN, and SABLE.