A-Yup. Doerner didn't mention Tiepolo's ochre grounds ? They're interesting to see in his small scale proposals, and they lent special verve to those "blue heaven" skies in his ceilings.
The interesting thing about toning a ground is that applied over an initial white base, the mechanics of reflection through transparent layers remains the same. There's no question it's much easier and pleasant to work on a toned ground than "stark white".
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