Colours

Here are the colours :

Black ------ Nero
Blue ------- Azzuro
Brown ------ Marrone
Gray ------- Grigio
green ------ Verde
Orange ----- Arancione
Purple ----- Viola
Red -------- Rosso
Pink ------- Rosa
Yellow ----- Giallo
White ------ Bianca

Colours are adjectives, therefore like most adjectives they follow the noun.
To ask what colour a thing is/things are?

Di che colore é / Di che colore sono ?

Singular -------- il vestito giallo (the yellow dress)
Plural ---------- i vestiti gialli (the yellow dresses)

Singular -------- la maghetta rossa (the Red T shirt)
Plural ---------- le maghette rosse (the Red T shirts)