I always understood it to depend on whether you have a BCC or BCI. There is a post somewhere in this section that says BCC's tend to hold the red in there tails as they age, while BCI's tend to brown out as they get older.
Of course I could just be up in the night.
Edit : Found the post, Its in the FAQ written by JLC.
12. How can I tell the difference between a BCI and a BCC?
There is no hard fast rule, as there is a lot of variation in each subspecies. In general though, a BCC has prominent “widow's peaks”. This means that the dark brown saddles on the back look like this: { } { } { }. The saddles on a BCI are usually more rounded like this: ( ) ( ) ( ). BCC are much more likely to keep that typical blood-red colored tail into adulthood, while a BCI’s will usually dull and brown out as it ages.
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