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Richard,
As Alexandra just demonstrated, Raw Umber is a mixture of red, blue and yellow, but dominated by the yellow.
If your Raw Umber turns greenish in mixtures with Yellow Ochre it is because it is a greenish Umber ( containing a relatively larger share of blue ). The result of mixing colors will always be something in between the implicite colors
The three Raw Umbers shown below is from the same brand ( Artifex)and shows an almost Yellow Ochre variation called Yellow Umber. The Raw Umber Light is greenish and the last one named Raw Umber Deep is more reddish.
I have placed the 3 Umbers in the color wheel along with Burnt Sienna #4, Venetian Red #5 and Indian Red #6.
Color mixing is so simple to understand if one does not put the artificial names on them. Tell me what color is coffee ? Depends on the strength and if one uses milk and sugar. Pigeon Blue ? Burnt and Raw Umber ?
The reason why we use certain colors like Raw Umber is that the pigment is at hand from the nature, it is colored eath in a useful hue and strength, just like Cadmium Red is useful. Their position on the colorwheel is quite accidental and should be regarded as such.
I do not pick my colors for the palette from how I like their hue or character but from how they mix with others. That is because I prefer to break the colors to not use the same color / hue / value over and over again. I prefer to use as few colors / tubes as possible.
Allan
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