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
And he answering said to them, When it is evening, ye say, Fair weather! for the sky is red.
And his garments became glistening, very white, so as no fuller on earth can whiten.
And they clothe him with purple, and having platted a crown of thorns, they put it on him.
And the soldiers platted a crown of thorns, and put it on his head, and put on him a purple robe, and approached him
since ye are manifestly shown to be a letter of Christ by means of our service, written not with ink, but with the Spirit of the living God; not on tablets of stone, but on fleshly tablets of the heart.
His head and his hairs were white as white wool, as snow; and his eyes were as a flame of fire;
And when he had opened the third seal, I heard the third living creature saying, Come! And I saw, and lo! a black horse, and he that sat on him, having a pair of scales in his hand.