And his pupils, people like Boltraffio, Luini, all start using coloured chalks.

他的学生, 例如Boltraffio和卢伊尼，都开始用染色粉笔来画。

Your initial reaction, you see a drawing on ink coloured chalks, but also ink washes on vellum, the initial reaction of course is Leonardo didn't do that.

你的第一个反应，当你看到一幅用彩色粉笔画的画，还在皮纸上看到水墨，第一个反应当然是这不是达芬奇画的。