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。

And once you're thinking about vellum and coloured chalks on vellum all of this falls into place.

一旦你想到皮纸和在皮纸上用染色粉笔画，这些内容都说得通了。

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。