Colour: A particular shade of red. To be precise, the range of colours around CIE chromacity x 0.41, y 0.27 to 0.33; depending on your hardware, they look something like:
... (hard palate[?]) (c, ch, j, jh, ~n)
Retroflex[?] (roughly the place of articulation of English alveolars like t, but with the tongue curled back) (t, th, d, dh, ...