the Lord spoke unto Moses
The general authority for the types of Exodus is found:
(1) as to the persons and events, in (1 Corinthians 10:1-11).
(2) as to the tabernacle, in (Hebrews 9:1-24). Having the assurance that in the tabernacle everything is typical, the details must of necessity be received as such. Two warnings are necessary:
(1) Nothing may be dogmatically asserted to be a type without explicit New Testament authority; and
(2) all types not so authenticated must be recognized as having the authority of analogy, or spiritual congruity, merely. The typical meanings of the materials and colours of the tabernacle are believed to be as follows: Gold, Deity in manifestation -- divine glory; silver, redemption (Exodus 30:12-16).
( See Scofield) - (Exodus 38:27),
brass, symbol of judgment, as in the brazen altar and in the serpent of brass (Numbers 21:6-9) blue, heavenly in nature or origin; purple, royalty; scarlet, sacrifice.