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
But He answered them, In the evening ye say, It will be fair weather, for the sky is red:
And He ordered them to cause all the people to sit down by companies upon the grass:
and his raiment shone, being exceeding white as snow, so as no fuller on earth can whiten.
and they clad Him in purple, and platted a crown of thorns and put it on his head,
And the soldiers platted a crown of thorns, and put it on his head,
being manifest that ye are the epistle of Christ, through our ministration, written not with ink, but by the Spirit of the living God; not on tables of stone, but on tables of the heart of flesh.
His head and his hairs were white like white wool, as white as snow; and his eyes as a flame of fire;
And when He opened the third seal, I heard the third animal say, Come and see. And I beheld, and lo, a black horse, and he that sat upon it had a balance in his hand.