'Blue' in the Bible

Which were clothed with blue, captains and rulers, all of them desirable young men, horsemen riding upon horses.

Fine linen with broidered work from Egypt was that which thou spreadest forth to be thy sail; blue and purple from the isles of Elishah was that which covered thee.

These were thy merchants in all sorts of things, in blue clothes, and broidered work, and in chests of rich apparel, bound with cords, and made of cedar, among thy merchandise.