Cynthia, I must say, these birds are brilliant with color .... most magnificent coloring!
In the SOP the color is described as:
Male:
Head: Plumage, brilliant reddish bay.
Neck: Hackle-- lustrous. golden bay. Front of neck-- same as breast.
Back: Brilliant deep chestnut red.
saddle: lustrous, golden bay slightly darker than hackle.
Tail: Main tail -- black.
Sickles-- rich, lustrous, greenish black.
Coverts-- lustrous, greenish black, edged with deep chestnut red.
Lesser coverts-- deep chestnut red.
Wings: Fronts-- medium chestnut red.
Bows-- brilliant deep chestnut red.
Coverts-- deep chestnut red.
Primaries-- upper web, medium red; lower web black edged with medium red.
Secondaries-- upper web, medium chestnut red, having broad black stripe extending along shaft to within one inch of tip; lower web medium chestnut red; shaft, red.
Breast: Medium chestnut red.
Body and fluff: Medium chestnut red.
Legs: Lower Thighs: medium chestnut red.