It spelled COLOR. The secret is great sps color is stable water parameters ca, alk, mag, ph, temp everything needs to kept stable. Sps do not like any changes, do any changes slowly. Good water quality is important keep po4 as close to 0 as possible and keep no3 from 0-5 ppm max. High flow and good light plays an important role as well, but if you have sps then you should have these covered already. Feeding sps zooplankton also helps with color.
http://en.wikipedia.org/wiki/American_and_British_English_spelling_differences
See -or, -our in differences between British and American spelling.
Ok sorry I speak American and we spell it color. If I type it colour spell check flags it.
It spelled COLOR.
Us Canadians spell it Colour as well. You silly yanks with your "standard" measurement system and bastardization of our language.
And for all of you we can end this little battle of wits quickly. You all speak derivatives of my native language if we want to get technical....GREEK. Every fish you own, every coral you keep, and every word you say is Latin is all stolen from Greek.