Furnace = Black center, outer barbs red/brown (there are many shades)
Coch-y-Bondduh ( there are a couple different spellings) = Black center, barbs more red than brown but also has black tips and sprinkles of black pigment on the barbs. I have raised many of them over the years and all have sold quickly. Google for some interesting reading. Wales, 1700s. Black.Red
Badger, Silver or Gold = Black center with barbs being one of the shades from almost white to golden. (comes from the Black family)
Greenwell = Either of the gold or silver badger with the black tips and sprinkles of black pigment on the barbs. ( also comes as full brothers and in my attempts to breed for them, I could not. Mother nature I'd say.