On the other end of the spectrum we have Red which I'm sure you know relates to Adam via adamah and Esau via Edom. This is going to be a great asset to the Seven Matrix thread! Thanks!
Sad to say, but I suspect that the blue will be the easiest, and that is because so much confusion has been created concerning the colors mentioned in the scripture. It would probably be best to use some image files for easy reference, the first and most logical being of course an image file of a typical rainbow: and from that we have various clues from the Prophets including the Apocalypse.
We can see from this that in the middle of the heavenly bow are the colors yellow, which would be the closest to the white light of the sun, and green, which would most likely be referred to as emerald. The light of the sun is more white than yellow, and so bright that we cannot even look directly at it for more than an instant, (and much longer than that, and we can even be blinded).
We have some colors mentioned in the Apocalypse where the rainbow is included, in the first reference therein, and both of these colors are intended, the bright white color is called iaspis, (the Hebrew transliterated would be yashpheh), and sardine, but neither of these colors seems to be correctly understood by most of the commentators I have read regarding these things, and the other color is the bow of emerald which is said to be roundabout the throne.
Revelation 4:2-3 KJV
2 And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne.
3 And he that sat was to look upon like a jasper
[G2393 ιασπις, iaspis] and a sardine stone:
[G4555 σαρδινος, sardinos] and there was a rainbow round about the throne, in sight like unto an emerald
[G4664 σμαραγδινος, smaragdinos].
Jasper is typically thought to be red but this is not the case in the text where the stones of the breastplate of judgment are named, at least not according to the Septuagint rendering of those names into Greek. In Exodus 28:20 we have the Hebrew word yashpheh as the third color of stone mentioned in the fourth row, however, the LXX produces onyx, (ονυχιον), for that color of stone, and although onyx does come in various colors, including shades of red and pink, this almost surely means white onyx as the most abundant and common color of onyx.
Exodus 28:20 KJV (Hebrew text)
20 And the fourth row a beryl, and an onyx, and a jasper:
[H3471 יָשׁפֵה yashpheh] they shall be set in gold in their inclosings.
So the third stone in the fourth row is yashpheh, which the KJV renders as jasper, but in the LXX it is rendered as onyx.
Exodus 28:20 OG LXX
20 και ο στιχος ο τεταρτος χρυσολιθος και βηρυλλιον και
ονυχιον περικεκαλυμμενα χρυσιω συνδεδεμενα εν χρυσιω εστωσαν κατα στιχον αυτων
Exodus 28:20 Brenton Septuagint Translation
20 and the fourth row, a chrysolite, and a beryl, and an onyx stone,
[ονυχιον] set round with gold, bound together with gold: let them be according to their row.
Why is this important? Scholarship says that sardinos
does not come from the fish, a sardine, but I would strongly suggest that it does indeed come from the fish, that is, the belly portion which is a creamy and silvery bright white color: and this can indeed be described as white onyx, and thus we have two colors mentioned in the Apocalypse passage quoted above that describe, by color, the purity and bright-shiny white light and cleanness and holiness of the One seated upon the throne.
Now look at this catch of Kinneret Sardines:
The Sea of Galilee (Kinneret), the lowest freshwater lake in the world, is famously mentioned in the Bible. It is the site where Jesus said, “I will make you fishers of men.” According to the Bible, four of the Apostles – Andrew, James, John, and Peter – worked as fishermen on the shores of the
israelinsideout.com
A bright white belly underside with a bow of emerald on the top portion of the fish? Is this an original or ancient species to Kinneret? I don't know, but sardines were certainly there in the first century, and most have the same silvery-shiny white underbelly, although there are varying colors and stripes on the top half of the fish depending on their classifications. The silvery-white shiny underbelly of the sardine is the most likely white color of the Greek words sardinos, iaspis, and onuxion, and probably also the Hebrew word yashpheh. It's a shiny white onyx color which is like the white light of the sun.