Sensex is trading in the red. The BSE 30 share Sensex was down 42 points at 19, 406.58 in afternoon trade. Earlier it recovered by over 93 points in opening trade on the back of a fresh spell of buying by funds as well as retail investors amid a firming trend on other Asian bourses. per cent, to 19,542.05. The National Stock Exchange index Nifty is also trading down by 14 points