Red: Any of various colors resembling the color of blood; the primary color at one extreme end of the visible spectrum, an effect of light with a wavelength between 610 and 780 nm. Crimson: a deep purplish-red.
Scarlet: A bright-red color inclining toward orange.
Spiritual metaphors and applications: Blood of Jesus, Atonement, Pentecost, Divine Love, Shield, Sacrifice, Obedience, Consuming Fire, Courage, Boldness, Warfare/Military Might, Humility, Purification, Sacrifice, Death to Self, New Wine, Passover, Riches, Cleansing, Praise, Worship. First Stone on the Breastplate: Ruby, Tribe of Judah.
A sample of Biblical scriptures: Genesis 9:4-5; Exodus 24:8; Joshua 2:21, 10:25; Nahum 2:3; Haggai 2:4; Zechariah 2:5; Mark 3:11; Luke 12:49; Philippians 2:8-11; 1 John 1:7; Revelation 1:5.