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
In answer he said: "In the evening you say, 'It will be fine weather, for the sky is red as fire';
Then he directed them to make all sit down by companies on the green grass.
Here in their presence he was transfigured; and his clothes also became glistering with a radiant whiteness, such as no bleaching on earth could give.
They clothed Jesus in purple, and plaited a crown of thorns, and placed it on his head.
and the soldiers plaited a crown of thorns, placed it on his head, and threw a purple cloak about him, and kept marching up to him,
Since all can see that you are a letter of Christ transcribed by men, written not with ink, but with the Spirit of the living God, not on tablets of stone, but on human hearts as tablets.
His head and his hair were as white as wool, as white as snow; his eyes were like a flame of fire,
And when he opened the third seal, I heard the third Living Creature say, "Come!" And I saw, and lo, a black horse! He who sat on him had a balance in his hand.