via Gurney Journey: “Most of the original background paintings for the animated classic Bambi are lost.
A lot of them were painted thinly in oil on glass or cardboard for use in the multiplane camera, while other finished backgrounds were painted in watercolor, depending on what the artist preferred.
But Disney’s archive still treasures the preliminary layouts for them. The layouts (shown at left above) were drawn with soft graphite on vellum. Those layouts work out the soft, atmospheric tonal transitions that gave Bambi its distinctive look.”