Ahem i'm not an expert in poetry/poems (a genre i dislike) but anyway i found the "black" part somewhat "lacking" (or well..."weak"), from the others i could imagine or "see" the colors from the text, in the "black" one i felt "emptiness" and not "color" (even if grim, black is a color). The part i liked more is "blue" maybe because it was (at least the beginning) rhymed (or because i like the ocean/sea)