silvering

A term used to describe a book whose edge or edges have been covered with silver leaf instead of gold.

Etherington & Roberts (1982)

Roberts, Matt, Don Etherington, and Margaret R. Brown. 1982. Bookbinding and the conservation of books: a dictionary of descriptive terminology. Washington: Library of Congress.

Additional reference: 
http://www.cool.conservation-us.org/don/dt/dt3128.html
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