Subtractive color model.
<a href="//commons.wikimedia.org/wiki/User:Cflm001" title="User:Cflm001">cflm</a> <small>(<a href="//commons.wikimedia.org/wiki/User_talk:Cflm001" title="User talk:Cflm001">talk</a>)</small>
Own work. Derived from <a href="//commons.wikimedia.org/wiki/File:Color_mixture.gif" title="File:Color mixture.gif">File:Color mixture.gif</a> by <a href="https://en.wikipedia.org/wiki/en:User:Andros_1337" class="extiw" title="w:en:User:Andros 1337">Andros 1337</a>, released under PD-shape.