These are the colors (Testors) which I've found most closely match the pictures (boxes, Osprey books, etc.). For one shade colors, here are the Testors numbers; black (1149 or 1749), white (1168 or 1768), gold (1144 or 1744), silver (1146), steel (1180 or 1780), brass (1182 or 1782), flesh (flat-various available shades or mixtures). All "XF-" colors are Pactra. Testors is sold in Europe under the name "Model Master".
ALL COLOR NUMBERS ARE TESTORS UNLESS OTHERWISE STATED.
NOTE: colors based on the Osprey books-Men At Arms series #121,#129,#158,#180,#283, and #291, and the box art.

REP. ROMANS, TRIARII & ARTILLERY
BODY PART(S)--COLOR
tunic & artillery mail trim--brit.crimson 2009
chain mail--steel
scabbard,shoes,belt--leather 1736
sword handle,feathers--black
helmet,greaves,sword handle tip,scabbard trim--brass
hair--brown,ital.dark 2111
shield--white
spears--wood 1735
shield center-top-bottom,spear tips,sword--steel
hands,face,legs--flesh
greaves straps--leather 1736
base--green 2029





REP. ROMANS, PRINCIPES
BODY PART(S)--COLOR
tunic--camouflage gray 1733
chain mail--steel
scabbard,shoes,belt--leather 1736
sword handle,feathers--black
helmet,greaves,sword handle tip,scabbard trim--brass
hair--brown,ital.dark 2111
shield--white
spears--wood 1735
shield center-top-bottom,spear tips,sword--steel
hands,face,legs--flesh
greaves straps--leather 1736
base--green 2029





REP. ROMANS, HASTATI
BODY PART(S)--COLOR
tunic--camouflage gray 1733
scabbard,shoes,belt,straps--leather 1736
sword handle,feathers--black
heart plate,helmet,greaves,sword handle tip,scabbard trim--brass
hair--brown,ital.dark 2111
shield--white
spears--wood 1735
shield center-top-bottom,spear tips,sword--steel
hands,face,legs--flesh
greaves straps--leather 1736
base--green 2029





REP. ROMANS, VELITES
BODY PART(S)--COLOR
tunic--camouflage gray 1733
scabbard,shoes,belt--leather 1736
sword handle--black
helmet,sword handle tip,scabbard trim--brass
panther skin--black
lion skin--yellow zinc chrom. 1184+white
wolf skin--tan,ital.sand 2110+white or dark gray 2036
bear skin--brown,ital. dark 2111
shield--white
spears--wood 1735
shield center-rim,spear tips,sword--steel
hands,face,legs--flesh
base--green 2029





REP. ROMANS, EQUITES (CAVALRY)
BODY PART(S)--COLOR
tunic--camouflage gray 1733
chain mail--steel
cuirasse,helmet--brass
shield(w/circle),sword handle,feathers,plume--black
shield(w/bar)--red,brit.crimson 2009
shield back--dark tan 1742
scabbard,shoes,belt(w/chain mail)--leather 1736
scabbard trim,sword handle tip,belt buckle--brass
spears--wood 1735
spear tip,sword--steel
hands,face,legs--flesh
hair--brown,ital.dark 2111
shield(w/bar) rim & bar & M--baby blue (mixed)
HORSE--whatever
blanket--blue,RAF PRU 2061
blanket stripe--sea blue 1172
straps--leather 1736
buttons--steel
base--green 2029