Wilson's Dictionary of Bible Types
Genesis 38:30 (a) Since Pharez is found in the genealogy of CHRIST, this thread may indicate that Zarah would need the blood to redeem him. (See Matthew 1:3).
Exodus 25:4 (c) It may be that this color all through the tabernacle equipment served to remind the Israelites that the blood was always essential in every part of life and service.
Leviticus 14:4 (c) This probably is a picture of the value of the blood in every sacrifice for sin. Sins are put away only by and through the Blood of JESUS.
Joshua 2:18 (c) This is usually taken to be a picture of the precious Blood of CHRIST. The woman was sheltered because of the red cord. The sinner is sheltered under the red Blood of the Saviour.
Song of Solomon 4:3 (a) The smooth, pretty lips of the bride are compared to the scarlet line. It is a picture of the loveliness of the church (the bride) in the sight of the Bridegroom, her Lord.
Isaiah 1:18 (a) It is used to describe the stain of sin in contrast with the white garments of salvation.
Matthew 27:28 (c) It is a sign of royalty, though used here in mockery.
Revelation 17:3 (b) It indicates the enormous sin and wickedness of this woman whose stain of sin covered her completely. The woman represents the apostate church.
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Watson, Walter. Entry for 'Scarlet'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/scarlet.html. 1957.