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A reproduction of a drawing by means of a contact printing process on lightsensitive paper, producing a negative image consisting

(Brit.) A hydraulic lime obtained by burning blue lias limestone. When mixed with water, it has a set which is

Said of a steel nail surface that has been heated so that its surface takes on an oxidized bluish hue.

A brick of high strength whose blue color results from firing in a kiln in a flame of low oxygen

A small hole in a mold or plaster cast, formed by trapped air.