According to the space marine painting guide:
Raven Guard Armor
Basecoat: Chaos black citadel spray.
First highlight: Dark Reaper
Second highlight: Administratum Grey
Raven Guard Metal
Basecoat: Leadbelcher
Wash: Nuln Oil
First highlight: Runefang Steel
Pick out some details with: Balthasar Gold
Raven Guard Red Trim
Basecoat: Khorne Red
First Highlight: Troll Slayer Orange
White Armor
Basecoat: Ulthuan Grey
Shade: Drakenhof Nightshade
First Highlight: White Scar
And what it will looks like: