"Don't put needless expense into painting a head! Don't try to match tints! Rose and pearly colours blend into each other so that no one can unite them if painted separately. Keep the impression of your subject as one thing!"

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In the case of composite colour, an infinity of systems must be obtained for maxima infinitely slight and with an infinity of interval values separating them - that is to say, the whole thickness of the sensitive layer is occupied in continuous manner by these maxima.

— Gabriel Lippmann