Gold slipped 85 rupees, to 29,355 rupees per ten grams at Delhi's bullion market on Thursday, on reduced offtake by stockists and retailers at existing high levels, and a weak global trend. Silver fell 400 rupees, to 57,500 rupees per kilo, on lack of buying by industrial units.In London, gold dropped 0.1 per cent, to 1,763 dollars an ounce.