We perceive them as bright or dark, deep or light, sort of this and sort of that, but regardless of whether it's a royal blue or an earth brown, colour affects us. It has been proven that colours have an affecct on our brains and they do produce different emotional results. What do you think of when you see red? Passion? Maybe anger? Regardless, the response is dramatic. Colours as used in magick are similar in that they should evoke a response from you, but keep in mind, your response to say purple, may be different than mine and this is perfectly okay. If you see pink as healthy or health, so be it. The colours must have meaning to the person using them.