At the pre-opening bell, the frontline index S&P BSE Sensex opened in red with a loss of 96.41 points or 0.12%. Sector-wise, in the pre-opening session, metals jumped by 0.78%, power zoomed by 0.46% and auto soared by 0.29%. Meanwhile, Supreme Petrochem, Rattanindia Enterprises and Tilaknagar Industries Ltd emerged as the top gainers of BSE on Tuesday.