Concerning the "breastplate".what is the authors intent? Book of Revelation

Question

In the book of Revelation at chapter 6 verse 1-8 (NIV), we read about the four horses which are released when the lamb that was slain opens the seals.Read here

Again in Revelation 9 verse 17, we read about the horses,and in this verse the author is giving a detailed description about the horses and riders that he saw in his vision.Read here

I am trying to understand what "breastplate", belongs to which rider of each horse.There are four horses and riders, but only three breastplates (each with a different colour),which could suggest that one of the riders does not receive a breastplate.

Revelation 9:17 New International Version (NIV)

17 The horses and riders I saw in my vision looked like this: Their breastplates were fiery red, dark blue, and yellow as sulfur. The heads of the horses resembled the heads of lions, and out of their mouths came fire, smoke and sulfur.

Is it the authors intent that the reader should be able to allocate a breastplate to each rider?

Related read here.

Answer 1

This answer will serve to substantiate from the Greek text the impression of one commenter:

Καὶ οὕτως εἶδον τοὺς ἵππους ἐν τῇ ὁράσει καὶ τοὺς καθημένους ἐπ᾿ αὐτῶν, ἔχοντας θώρακας πυρίνους καὶ ὑακινθίνους καὶ θειώδεις... (NA-28)

The word θώρακας is from θώραξ (thorax, meaning breastplate); it is a masculine noun, here declined as accusative plural. What follows are three adjectives, each declined in the accusative plural (lexical form > inflected form):

• πύρινος > πυρίνους ("fiery")
• ὑακίνθινος > ὑακινθίνους ("hyacinth-like")
• θειώδης > θειώδεις ("sulfur-like")

As you can see, each of the three adjectives is inflected like (and governed by) the accusative plural noun θώρακας. So to the OP's question:

Is it the authors intent that the reader should be able to allocate a breastplate to each rider?

No. Instead, all three adjectives apply to each of the three θώρακες: they are multi-colored.