Note 1963 — BOOK XXXV. AN ACCOUNT OF PAINTINGS AND COLOURS.
John Bostock translation
“Penicillus.” This was the hair-pencil or brush, which was used by one class of painters, in contradistinction to the stylus or cestrum used for spreading the wax-colours. Painters with the brush used what we should term “water-colours;” oil-colours, in our sense of the word, being unknown to the ancients.