There are 61 groups of them. For the broad generalizations about color to be useful, they must be considered in the context of a site's message and its target market demographics. Imagine a toy site done in deep, dark colors definitely not the right approach. Each gender's color preferences and perceptions vary, adding to the mix of color considerations. Women have a clear preference for cool colors, Natalia Khouw noted.
Men are generally more tolerant of black, white and gray than women.
You can test how color-blind visitors will view your color scheme by converting it to grayscale or black and white. For the color-blind, What Color is a tool for identifying RGB value as well as the color name.