There are different ways to mix color: http://en.wikipedia.org/wiki/Subtractive_color http://en.wikipedia.org/wiki/Subtractive_color http://en.wikipedia.org/w

There are different ways to mix color: http://en.wikipedia.org/wiki/Subtractive_color http://en.wikipedia.org/wiki/Subtractive_color http://en.wikipedia.org/wiki/Additive_color http://en.wikipedia.org/wiki/Additive_color Light is additive, so that's yellow. He's talking about pigments and paints, which are subtractive.