Quote Originally Posted by Athiril View Post
With colour negative overexposing will decrease your saturation. The amount of opposing colour will increase more than subject colour density, thus less separation and also less contrast.
Well we need to remember that lightness and saturation are not the same. A thicker negative simply prints lighter at a given enlarger exposure than a thinner one.

So, extra exposure of the film requires a corresponding eNlarger exposure change to place the main subject at the same brightness on the paper. As long as the print is coming from the straight line of the neg there will be little if any difference for the main subject on negs that are exposed several stops differently.

What extra film exposure can do on C-41 film is give us better shadow color and tone separation by getting them up onto the straight line. Better shadow color can easily be viewed as providing a better/more saturated photo.

Extra exposure reduces graininess too.

Given the really long straight line available on C-41, some extra exposure has little if any downside.