631

The preparation of oils.

Since walnuts are enveloped in a thin rind, which partakes of the nature of ..., if you do not remove it when you make the oil from them, this skin tinges the oil, and when you work with it this skin separates from the oil and rises to the surface of the painting, and this is what makes it change.

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.

VII * X
Notebooks of Leonoardo da Vinci
VIII: Botany for Painters and Elements of Landscape Painting.
. . .
611
Of chalk and paper.
612,
613,
614,
615,
616,
617
On the preparation and use of colours.
618,
619,
620,
621,
622,
623,
624,
625,
626,
627
Of preparing the panel.
628
The preparation of oils.
629,
630,
631,
632,
633,
634
On varnishes [or powders].
635,
636,
637
On chemical materials.
638,
639,
640,
641,
642,
643,
644,
645,
646,
647,
648,
649,
650
The relation of art and nature.
651
. . .