ultramarine

ultramarine

1. a vivid blue colour

2. from across the seas

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

ultramarine

A blue pigment used in paint; once obtained from crushed lapis lazuli; now manufactured synthetically by calcining aluminum silicate and sodium sulfide; has good alkali resistance, but is sensitive to acids.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.