What is Red?

I woke up this morning with a very strong feeling that I should wear red today. So here I am in a red sweater, feeling very good. I don't know why, but something about the red is very appealing to me today. Then I ran across this page on color energy.

I wonder why all these colors have only positive attributes. What happens when you wear two colors that clash with each other, or if you only dress in black or white?