Reference: Colours
Hastings
The colours named in OT and NT, as in other ancient literatures, are few in number, and of these several are used with considerable latitude.
1. White as the colour of snow in Isa 1:18, of the teeth described as milk-white (Ge 49:12), and of horses (Zec 1:8; 6:3,6); also of wool (Re 1:14)
See Verses Found in Dictionary
He answering said to them, In the evening ye say, It will be fair weather; for the sky is red:
And he commanded them to make all sit down by companies on the green grass.
And his raiment became shining, exceeding white, as snow, such as no fuller on earth can whiten.
And they clothe him with purple, and having platted a crown of thorns, put it about his head.
And the soldiers having platted a crown of thorns, put it on his head, and put on him a purple robe, And said, Hail, king of the Jews.
Manifestly declared to be the letter of Christ ministered by us, written not with ink, but with the Spirit of the living God, not in tables of stone, but in the fleshly tables of the heart.
His head and hair were white as white wool, as snow,
And when he opened the third seal, I heard the third living creature say, Come. And I saw, and behold a black horse, and he that sat on him had a pair of scales in his hand.