Gold prices weakened by Rs 25 per 10 gram in the bullion market here due to poor demand, a day after the precious metal climbed to an all time high of Rs 16,850 per 10 gram. The precious metal had closed in the Rs 17,000 per 10 gram level yesterday on high demand, influenced by India's purchase of the metal from IMF. "Such high levels in gold prices attracting retailers to sel