What is the difference in water color trailing behind a sailboat called?

Question

Naturally, the waves that a boat makes is called a wake. I'm not talking about the waves.

But suppose a sailboat is moving through calm water slowly. There is a difference in water color trailing behind even though the waves are consistent.

What is that called?

Answer 1

I dunno, sorry

Answer 2

wake

Answer 3

the wake is the visible path, not just the waves.

Answer 4

awash  i think