Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci


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.


648.


A white horse may have the spots removed with the Spanish haematite
or with aqua fortis or with ... Removes the black hair on a white
horse with the singeing iron. Force him to the ground.


649.

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