It is from rubrica also, that ochra1 is prepared, the rubrica
being burnt2 in new earthen pots well luted with clay. The
more highly it is calcined in the furnace, the better the
colour is. All kinds of rubrica are of a desiccative nature, and
hence it is that they are so useful for plasters, and as an application
even for erysipelas.
1 Whence our word "ochre." See "Sil," in B. xxxiii. cc. 56, 57.
2 Theophrastus, on the contrary, says that it is "ochra" that is burnt,
in order to obtain "rubrica."
The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.
An XML version of this text is available for download,
with the additional restriction that you offer Perseus any modifications you make. Perseus provides credit for all accepted
changes, storing new additions in a versioning system.