Featured colours of the Mabinogi are red, white/ paleness, grey/ dun and gold.
RED and WHITE associate with magical beings e.g. Cwn Annwfn, Hounds of Annwfn First Branch; or the white boar Third Branch. They are said to dazzle, or glitter. It requires a shift in vision to grasp how striking anything was which shone or glittered, as out modern world is so full of this. In a world of dun any whiteness or shininess is exciting.
GREY/ DUN is the practical hue of hunting gear, ref. Arawn’s first appearance First Branch.
See Hemming , Jessica., 2012. Red, White, and Black in Symbolic Thought: The Tricolour Folk Motif, Colour Naming, and Trichromatic Vision. Folklore 123, 310–329.
GOLD is especially featured and acts as a connector between Pwyll, the Queen of Annwfn, Rhiannon, Gwawl, the baby prince Gweri/ Pwyderi, and baby hero Lleu. Gold brocaded silk meant extremely high status as it was traded under strict cartel from Byzantium and Venice.
Morgain, Shan “Gold Silk” unublished except on Academia.edu 2014
Morgain, Shan, 2015. “The Golden Thread: an example of Mabinogi subtlety.” Conference paper, Medium Arvum, Oxford; April 2015.