RE: Red on White Plicatas.

If red and brown is a combination of carotene (yellow) and anthocyanin (violet) pigments then what about red on white plicatas such as Taholah. Harlequin, High Life, Broadway, Different Design and Spice Lord (as examples)?  The red and brown colour is a combination of yellow and violet. Shouldn't the anthocyanin and carotene be distributed in the same locations to give us the red.
What happens when the anythocyanin is absent in a red on white plicata? Removed by a Dominant Reduction of Anthocyanin or a Recessive Reduction of Anthocyanin.

I have posted two sets of photos to Iris-photos that have me wondering about this. One set has a photo of a violet-purple stripped on white ground, a yellow stripped on white ground and a flower which has both anthocyanin and carotene and is a red-brown stripped om white ground. The second set of photos is of a chaisma of the IB Summer Camp where half of the petals have no anthocyanin and on this part we see a pattern of yellow distributed in a manner much like a plicata pattern. Darker in veins and at hafts, and more pigment near the petal edges.

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