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 and said to them, When it is evening you say, It will be fair weather for the sky is red;
And he commanded them to cause all to recline in companies on the green grass.
and his garments became shining, extremely white, so that no fuller on the earth could whiten them.
And they put on him a purple garment, and plaiting a thorny crown put it on him.
And the soldiers having plaited a crown of thorns put it on his head; and they put a purple garment about him,
for you are manifestly an epistle of Christ delivered by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of hearts of flesh.
and his head and hairs were white as white wool, as snow, and his eyes like a flame of fire,
And when he opened the third seal, I heard the third cherub say, Come. And I saw, and behold, a black horse, and he that sat on it had a pair of scales in his hand.