I am about to paint the barrow wights and wondered what colour the armour is on the official colour scheme, Is it just Warlock bronze washed with Agrax?? Also I was thinking of washing each barrow wight with a different colour,maybe one green, one violet etc what are your thoughts on this?

Well, for starters, violet is an unusual colour choice, purple or indigo would suit it better, otherwise it's end up looking like an anthropomorphic flower.

Secondly, I think Barrow Wights make more sense if they're either all the same colour, or maybe (if you have quite a few of them, a couple of slightly different shades would be okay, e.g. turquoise and green, or indigo and blue, or dark grey and light grey.

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"I am the Flying Spagetti Monster. Thou shall have no other monsters before me"
-FSM.

I'm not sure that I'd be much help with the paint colors, as I use a mish-mash of GW, Vallejo, and other paints.

I think it would look fine to use different colors on the Barrow-wights, however, I would use the same color on the flesh, hair and armor, and maybe just vary he color of the cloth (and even then I would give them all a similar wash to tie them all together). I think it would look cool like that, and would help you to tell them apart for record-keeping purposes.

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Respectfully,
Jonathan

Do what is right, love mercy, and walk humbly

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