Here are some Color Recipes for Warhammer 40,000 Adeptus Mechanicus from Gallery: Adeptus Mechanicus. Please take note that this is a simple color 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.
Metal:
Rust (val a),*
Gun Metal (ap), flbr
Shining Silver (ap), flbr
True Copper (ap), alternative spots
Strong Tone (ap), wash / wash*
Shining Silver (ap), l&p
RED Vehicles:
German Red Brown (val primer), *
Desert Tan (val primer), *preshade
Mix: German Red Brown 1:1 Red RLM 23 (val a),*
Bonewhite (val a), stencil stripes
Smokey Ink (val), weathering
Red Clothes:
Hull Red (val),
Strong Tone (ap), wash / wash*
German Red Brown (val primer), flbr, bl
German Red Brown (val primer), bl, edges
Scarlet Blood (val), edges
Black Clothes:
Panzer Dark Grey (val a),
Fenrisian Grey (gw), flbr
Hero: Ghost Grey (val), l&p
Strong Tone (ap), wash
Hero: Ghost Grey (val), l&p
Hero: Off White (val), l&p
Blue Light:
Light Sea Blue (val a), *
White (val a), *
Guilliman Blue (gw), wash
Off White (val), l&p
Purity Seals:
Hull Red (val),
Strong Tone (ap), wash
Rosy Flesh (val), p
/
Flayed One Flesh (gw),
Pallid Wych Flesh (gw), flbr
Strong Tone (ap), wash
Black markings,
Skulls:
Ghost Grey (val),
Strong Tone (ap), wash
Ghost Grey (val), p
Skin:
Tan (val),
Dwarf Flesh (gw), flbr
Flesh (val a),
Strong Tone (ap), wash
Hero: Flesh (val), l&p
Hero: Pale Flesh (val), l&p
Bases:
Earth (val a), *
Light Brown (val a), *
European Dust (val), *
Sandy Desert (AK texture),
Ice Yellow (val), drbr, flbr,
TUFT: Wasteland Tuft (ap),
TUFT: Burned 6mm wild (gg),
l&p – lines and points,
p – points,
dl – deep lining,
bl – blend,
gl – glaze,
drbr – drybrush,
flbr – flatbrush,
lobr – loaded brush,
stpl – stippling,
*Airbrushed (with multiple layers and mixes)