“They make a fine purple colour by treating bilberry in the same way and mixing it with milk.”

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book VII, Chapter XIV, Sec. 2

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Do you have more details about the quote "They make a fine purple colour by treating bilberry in the same way and mixing it with milk." by Vitruvius?

Vitruvius203

Roman writer, architect and engineer -80–-15 BC

Bill Watterson (1958) American comic artist

The Authoritative Calvin and Hobbes
Source: The Authoritative Calvin and Hobbes: A Calvin and Hobbes Treasury

“Use materials with forceful MUSCULAR colours – the reddest of reds, the most purple of purples, the greenest of greens, intense yellows, orange, vermillion – and SKELETON tones of white, grey and black.”

Giacomo Balla (1871–1958) Italian artist

(Manuscript, 1914); as quoted in Futurism, ed. Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 148
Futurist Manifesto of Men's clothing,' 1913/1914

“Often a purple patch or two is tacked on to a serious work of high promise, to give an effect of colour.”
Inceptis gravibus plerumque et magna professis purpureus, late qui splendeat, unus et alter adsuitur pannus.

Horace Ars Poetica

Inceptis gravibus plerumque et magna professis
purpureus, late qui splendeat, unus et alter
adsuitur pannus.
Source: Ars Poetica, or The Epistle to the Pisones (c. 18 BC), Line 14