Blue

Blue - (Easton's Bible Dictionary)

Generally associated with purple (Ex. 25:4; 26:1, 31, 36, etc.). It is supposed to have been obtained from a shellfish of the Mediterranean, the Helix ianthina of Linnaeus. The robe of the high priest's ephod was to be all of this colour (Ex. 28:31), also the loops of the curtains (26:4) and the ribbon of the breastplate (28:28). Blue cloths were also made for various sacred purposes (Num. 4:6, 7, 9, 11, 12). (See [71]COLOUR.)

Blue - (Webster's 1828 Dictionary)

BLUE, a. blu. One of the seven colors, into which the rays of light divide themselves, when refracted through a glass prism. There are various shades of blue, as sky-blue, or azure, Prussian blue, indigo blue, smalt blue, _c.

Prussian blue, a combination of the oxyd of iron with an acid called ferro-prussic.

BLU'E, v.t. To make blue; to dye of a blue color; to make blue by heating, as metals _c.