647

On chemical materials.

Put marcasite into aqua fortis and if it turns green, know that it has copper in it. Take it out with saltpetre and soft soap.

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.
. . .
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,
652
Painting is superior to poetry.
653,
654
Painting is superior to sculpture.
655,
656
Aphorisms.
657,
658,
659
On the history of painting.
660,
661
The painter’s scope.
662
. . .