Red armor dye is a dye in the Blood and Wine expansion that can be used to change the color of any witcher armor to red.
Crafting Requirements 
Notes
- While it used to be purchasable from the Dye Merchant in Beauclair Port, it appears this dye, along with the 3 other relic level dyes (black, purple, and white) were removed at one point from this merchant's store and can now only be crafted or found as rare loot.