The main reason is something we should always be on the lookout for, redundancy - it\'s basically a dark, dull orange so why do you need it if you\'re already using yellow and red? If you use it
instead of yellow and red you\'re fixing the hue, when you want (and need) some variation for realistic results.
The second major reason is that it\'s generally, should be in fact, semitransparent or transparent; and for the thickness of paints we apply opacity is almost always a good idea of course. Used for some variation of the paint-on/wipe-off method this semitransparency is fine, but it\'s not desirable within a mixture
if avoidable.
In relation to its use as per that method, for busts in particular, this kind of very general painting method is akin to washes for shading a mini; works as far as it goes, but it\'s not for high-end results. When you paint in this way there\'s also the problem that you\'re essentially making brown shadows - for any of us whiteys, look at the shadowed side of your hand beside the mouse, is it a sienna colour? Nah
Einion