A trick from the dark side.
When you have to shoot in low light, and I mean super-super low light (think f/1.4 at 1/15th sec at 3200 ISO), you can underexpose and pull up the image later.
This introduces nice (grain).
So then you… and here’s the trick…..Convert it to black and white.
Noise looks OK in black and white, and muddy colour disappears.
So sometimes b&w just means “it wasn’t good enough for colour”.
And then, sometimes an images just looks better in b&w.