Scheme Reference
All Ryuken units paint their BattleMechs charcoal gray, and each regiment chooses its own accenting colors.
The members of the Ryuken-roku accent their BattleMechs and other vehicles with red.
Field Manual: Draconis Combine
Artist Notes
The dark grey for my Ryuken is Eshin Grey with a wash of Nuln Oil. After the wash, I put another layer of Eshin Grey on the raised panels and then did some edge highlighting with Dawnstone. The red accents are Evil Sunz Scarlet with Squig Orange highlights. All of those are Citadel Colour paints from Games Workshop.