[932] The colour now known by painters as Emerald green.
[933] As a “trigarius.” See B. xxviii. c. 72, and B. xxix. c. 5. From
Suetonius, c. 18, we learn that the Emperor Caligula, also, had the
Circus sanded with minium and chrysocolla. Ajasson is of opinion that
the chrysocolla thus employed was a kind of yellow mica or talc.
[934] “Arenosam.” He alludes, probably, to the kind previously
mentioned as “aspera” or “rough chrysocolla.”
[935] For its identification, see B. xxxiv. cc. 26, 32.
[936] See B. xxxv. cc. 12, 18.
[937] Making a spurious kind of “lomentum,” possibly, a pigment
mentioned in c. 57 of this Book. This passage seems to throw some
light, upon the words “in lomentum,” commented upon in Note 929 above.
[938] As to durability, probably.
[939] It was the mineral, probably, in an unprepared state.
[940] Gold-glue or gold-solder.
[941] See B. xxxi. c. 46, as to the “nitrum” of Pliny. Galen, in
describing the manufacture of “santerna,” omits the nitre as an
ingredient.
[942] “Argentosum.” The “electrum,” probably, mentioned in c. 23.
[943] As to the “cadmia” of Pliny, see B. xxxiv. c. 22.
[944] “Plumbum album.” Tin, most probably. See B. xxxiv. cc. 47, 48,