"Alumina" Quotes from Famous Books
 ... circumspectly, taking care to keep it in contact with the flame, so that it may not harden during the operation. Chemical analysis shows the constituent parts of Egyptian glass to have been nearly identical with our own; but it contains, besides silex, lime, alumina, and soda, a relatively large proportion of extraneous substances, as copper, oxide of iron, and oxide of manganese, which they apparently knew not how to eliminate. Hence Egyptian glass is scarcely ever colourless, but inclines to an uncertain shade of yellow or green. Some ill-made ...
— Manual Of Egyptian Archaeology And Guide To The Study Of Antiquities In Egypt • Gaston Camille Charles Maspero |
