Other glass imitations, such as the opal, have a tolerably good representation of the "fiery" opal given to them by the admixture, in the glass, of a little oxide of tin, which makes it somewhat opalescent, and in the setting is placed a backing of red, gold, copper, or fiery-coloured tinsel, whilst the glass itself, at the back, is painted very thinly with a paint composed of well washed and dried fish-scales, reduced to an impalpable powder, mixed with a little pure, refined mastic, or other colourless varnish.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin
While the men were making fires to heat their tar they noticed that the burning wood sent forth a heavy odour which was like mastic; and the Admiral, now always busy with optimistic calculations, reckoned that there was enough in that vicinity to furnish a thousand quintals every year.
"Christopher Columbus, Complete"
Filson Young
The lands were more lovely than the finest land in Castile; the rivers were large and wide, the trees green and full of fruit, the grasses knee-deep and starred with flowers; the birds sang sweetly all night; there were mastic trees and aloes and plantations of cotton.
"Christopher Columbus, Complete"
Filson Young