From sketches in his notebook, we know that Leonardo had already begun working on his portrait of Saint John the Baptist (fig. 128) while in Milan in 1509.4 But as with many of his late paintings, most of which he ended up working on out of personal passion rather than to fulfill a commission, he carried it around with him and intermittently enhanc

The next oil I would like to mention is Walnut Oil again naturally a very clear oil, it dries faster than poppyseed and it is felt to have an excellent refractive index for displaying pigments with the most possible vibrancy, it potentially can hold more pigment than linseed or poppyseed.