depending on what you want it to represent (real hair?) like some of our PM knght armour, (both Graham & Hadoque are right) there are gun-metal (I follow Tamiya colour charts) versions, with their own part numbers (breast plates, halberds etc), although I dont have these chainmail hair pieces, I think those I saw in photos must be these 'charcoal' versions.
mine are supposed to be black/black lacquer so I sprayed using Tamiya gloss black.