There are several writing in the Bible concerning the color red or scarlet, or crimson. The color red has been used in Priestly garments and even used to describe how our sins have earned death, but because of Our Merciful Savior JESUS CHRIST we have Eternal Life. I am not a Bible Prophecy expert. I believe we all should be aware and do our best to talk to GOD about the Bible Prophecies. GOD being the Spirit of Truth, would clear misunderstandings that we have concerning HIS Word, especially to increase ones wisdom and mission for them life; I believe. Reading about this red heifer reminds me of a documentary I watched maybe a couple of years ago now concerning the rebuilding of the 3rd Temple and the requirement of a red heifer. I think I remember reading or hearing that there are even tribes who are herders or shepherds for this heifers. I was able to find the article to the link below that speak of Biblical Prophecy coming to pass.
https://www.thesun.co.uk/news/7217719/bible-prophecy-apocalypse-firs-red-heifer-born-israel/