Complementary colors are pairs of colors that really goes well together creating a high contrast, as well as attention of viewer.
                     
                     On a color wheel these colors stand just opposite of each other.
                     
             
If you want to focus attention of a viewer on certain areas of your painting , you can try to use complementary colors to highlight the same. As shown in picture, following pairs go together with each other-
                         
                         
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