Even as the headline index ended flat today, Nifty formed a reasonable positive candle on the daily chart, which signaled the comeback of bulls after a minor downward correction. Analysts said the short term trend of Nifty remains negative, but the emergence of buying from the intraday lows of Monday could be a cheering factor for bulls to make a comeback. A sustainable up move only above the hurdle of 18650 levels could confirm an uptrend…