At one time or another we all want to conceal some type of nasty imperfection on our face. Most flaws on our face are color-related flaws such as dark, bluish under-eye circles, red blemishes or brown birthmarks to name but a few.
Using a colour wheel can help rectify these imperfections. Opposite colours in the wheel neutralise each other. For example if you have a reddish coloured pimple you would use a greenish based concealer or neutraliser to hide it. The trick is to truly evaluate the colour of the flaw and then choose the opposite colour to neutralise it.