Vellum is a sheet of specialty prepared skin of lamb, calf, or goat kid used for binding a book or for printing and writing.

Vellum is a translucent material produced from the skin of a young animal. The skin is removed, cleaned with chemicals, drawn over a frame to dry, and then cleaned up to create a paper like surface. Print ink and colors tend to adhere to vellum very well.

Collectors should be aware that storing vellum collection need to adhere to the optimal temperature for the preservation of vellum is 20 ▒ 1.5 ░C (68 ▒ 3 ░F).

Modern paper vellum, also known as vegetable vellum, is a different synthetic material used for blueprints, plans, and sometimes books and resembles true vellum.
example of vellum