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, 'It will be fair, for the heaven is red;'
And He commanded that all should recline by companies on the grass.
And His garments became shining, exceedingly white, such as no fuller on the earth can so whiten.
And they clothe Him with purple; and, having platted a crown of thorns, they put it on Him.
And the soldiers, having platted a crown of thorns, placed it upon his head, and put on Him a purple robe;
being made manifest that ye are Christ's epistle ministered by us, written not with ink, but with the Spirit of the living God; not in tablets of stone, but in tablets that are hearts of flesh.
And His head and hair were white as white wool, as snow; and His eyes were as a flame of fire;
And, when He opened the third seal, I heard the third living creature saying, "Come." And I saw, and, behold, a black horse, and he who sat on him had a balance in his hand.