Bill Killian writes:
"FURO recognizes a GREY or ROAN to be like the SILVER but unevenly
lightening stating on the hips and tail.  I haven't seen a ferret
explicitly pointed out as this pattern."
 
This describes exactly what happened to Belle with her latest coat change.
She now has white guard hairs mixed with the black on her hindquarters, and
some on her tail. I would have called her an ordinary (well, extraordinary)
sable before that.
 
Linda, Richard, Joy and Belle ("Grey? I'm not getting grey. It's just very
light black."
[Posted in FML issue 1123]