I just checked in John Veniard's 'Fly Dressers Guide' 1966 1968 1970.
Badger - Black centre with white outer fibres, sometimes with black tips.
Furnace - Black centre with red outer fibres.
Coch-Y-Bondhu - As Furnace but with the edges of the fibres tipped with black.
Greenwell - Black centre with ginger outer fibres.
As Veniards is a very long established tying supply firm and John Veniard was an excellent fly dresser, I think I'll take his word.
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Although I will admit, I often have trouble with red, ginger and brown.