Coloring Mattes

Just throwin’ this question out there. Its not too important, more of a convenience than anything else…

I’m just curious if Nuke has an option to color a mask or matte with a specific color, so you can tell different mattes apart when you turn off your overlays.

Or should I just stop being lazy and just combine a constant color into a matte?

Oh, and I just thought of this while typing…

If I want to recreate a breakdown from a shot, and I wanted to do a quick pass to show the alpha channel of a greenscreen comp, how can I get a shot of just the black and white matte? I’ve tried selecting alpha, and rendering out in alpha, but instead i’ll get a red coloring, or other weird colors. How do you guys usually do breakdowns like this using nuke?

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