On a related note I'd add that the misconceptions many people have regarding how camera filters work extends into the darkroom when it comes how VC filters work. It just isn't well taught or explained in my opinion.

Quote Originally Posted by Drew Wiley View Post
Well expressed, Michael, speaking from the film's own perspective. I think AA confused a lot of people in that respect in his how-to books, overcomplicated the concept. Any added filter decreases the density of opposite hues in the film itself. What transpires during printing is the opposite - after all, it's a negative process!