Someone on
http://groups.yahoo.com/group/IndianCivilization/ pointed
out that Sanskrit [kRSNa] = "black" looks like (e.g.) Russian
[chernyy] = "black". He supposed that the original PIE root was
*[kors]; but surely original Sanskrit *[krs-na] would become *[krzna]
and then *[kr_na] or similar; is the original root *[kork]?