Pink was a color. Healthy Humans were said to be "in the pink", (TOS: "Turnabout Intruder"), while a pleased individual could be said to be "tickled pink". (TNG: "A Matter of Time")
The Andorian Thy'lek Shran referred to Humans as "pink skins", in reference to their skin pigmentation. (ENT: "The Andorian Incident", et al.) Quark once inquired if there were problems between Miles O'Brien and his wife Keiko in 2369, adding that "Your face gets very pink when it gets aggravated. Much more so than most other humans." (DS9: "Captive Pursuit")
Roses came in the color pink. In 2266, Charles Evans brought Janice Rand a pink rose, asking her if pink was her favorite color. (TOS: "Charlie X")
In 2371, Neelix served bantan, advising nobody eat any of the "little pink things". (VOY: "The Cloud")