What's the purpose of uncolored? I mean, we have monochrome, greyscale, sepia, black_and_white, various color_on_color, etc. Or is it supposed to be some vague umbrella term catching stuff not fitting into any of the other categories?

Well, it fits fine for something (post #668489) that I uploaded yesterday and for which none of the other tags would probably fit, so yeah. You've forgotten line_art btw.

I love learning about tags I should've known from day one~