<P> By convention , the three primary colors in additive mixing are red , green , and blue . In the absence of color , when no colors are showing , the result is black . If all three primary colors are showing , the result is white . When red and green combine , the result is yellow . When red and blue combine , the result is magenta . When blue and green combine , the result is cyan . </P>
mix red and green to make this colour
yellow