Here are some Colour Recipes for Infinity O-12 from Gallery: Infinity O-12. Please take note that this is a simple colour scheme, not covering multiple overlapping layers and blends in between, that lead to the final product. It is supposed to be used as guideline not a step-by-step.
BLACK armor:
Chaos Black, undercoat
Pancer Dark Grey (Val a), *
Fenrisian Grey (GW), flbr
Pale Wych Flesh (GW), flbr, l&p
Dark Tone Ink (AP), wash
Pale Wych Flesh (GW), l&p
WHITE armor:
Mix Ghost Grey (Val) 1:1 Wolf Grey (Val a),
Mix Ghost Grey (Val) 1:1 Wolf Grey (Val a),
White (Val a), bl
Off White (Val), bl, l&p
BROWN clothes:
Black Armor base,
Dark Brown (Val A), bl
Mix Strong Tone Ink (AP) 1:1 Soft Tone Ink (AP), wash
Karak Stone (GW), l&p
BLUE elements:
French Blue (val a),
Ultramarine Blue (val a), l
Heth Blue (gw), l&p
Glacier Blue (val), l&p
VISIERS:
Emerald (Val),
Mix Emerald (Val) x:x Off White (Val), l&p
TURQUOISE helmet dots,
Coelia Greenshade (GW),
BASES:
Coal Black (P3), *
Turquoise (Val), *
Turquoise (Val), l
Pale Wych Flesh (GW), l
Duck Egg Green (Val a), OSL
Light Livery Green (Val a), OSL
Off White (Val), l
l&p – lines and points,
p – points,
dl – deep lining,
bl – blend,
gl – glaze,
drbr – drybrush,
fltbr – flatbrush,
lobr – loaded brush,
stpl – stippling,
*Airbrushed (with multiple layers and mixes)