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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."

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