In the usage of modern practitioners of the artistic crafts of writing , illuminating , lettering , and bookbinding , `` vellum '' is normally reserved for calfskin , while any other skin is called `` parchment '' .
In the artistic crafts of writing , illuminating , lettering , and bookbinding , `` vellum '' is normally reserved for calfskin , while any other skin is called `` parchment '' .