De Coloribus / Leon Battista Alberti

"There is fire-colour, which they call red, and the colour of air which is said to be blue-grey [3], and the green of water, and the earth is ash-coloured. We see that all the other colours, like jasper and porphyry stone, are made from a mixture. So there are four kinds of colours, of which there are countless species according to the admixture of white and black."

(On Painting)

"Namque est igneus, ut ita loquar, color quem rubeum vocant, tum et aeris qui celestis seu caesius dicitur, aquaeque color viridis; terra vero cinereum colorem habet. Caeteros omnes colores veluti diaspri et porphyrii lapidis ex permixtione factos videmus. Genera ergo colorum quattuor quorum pro albi et nigri admixtione sunt species admodum innumerabiles."

(De Pictura)

"Fia colore di fuoco il rosso, dell'aere celestrino, dell'acqua il verde, e la terra bigia e cenericcia. Gli altri colori, come diaspri e porfidi, sono permistione di questi. Adunque quattro sono generi di colori, e fanno spezie sue secondo se gli agiunga oscuro o chiarore, nero o bianco, e sono quasi innumerabili."

(Della Pittura)

"Namelijk: de kleur van vuur [ignis] die rood wordt genoemd, lucht [aer] heeft de kleur van de hemel die men blauw noemt, de kleur van water [aqua] is groen; aarde [terra] is in werkelijkheid grijs van kleur. Andere kleuren, zoals jasper en porfieren stenen, zijn mengsels daarvan. Er zijn dus vier hoofdkleuren [genera] waar, door het toevoegen van wit en zwart, ontelbare soorten [species] van zijn."

(zelfde, eigen vertaling)

3) de kleur caesius (De Pictura) dan wel celestrino of azzurro (Della Pittura) is geen grijsblauw maar helder blauw (hemelsblauw of azuurblauw).