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>> (I am not sure if J-Ks is relatively reddening free compared to B-V,
>> which would be useful)...
The interstellar extinction at K is about a factor of 10 down from
that in the visible, so only when it's really large in the visible
is it significant for J-K colors. There's stuff near the Galactic Center
that has J-K of like 4 or 5 or 6, which is probably physically
impossible for an unreddened star, but no problem at all when the
visual extinction is 10 or 20 or 30 magnitudes!
\Brian
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