mumbai, Oct. 23 -- Those who bought gold and silver during the festive period in the past few days have been left with losses as prices fell after a mammoth rally. Experts, however, suggest continuing to add the safe-haven assets in a staggered manner, highlighting that the demand is driven by institutional investors and central banks. Since hitting its October 14 high, domestic spot 999 silver has fallen 15% to Rs.152,501 per kg on October 22 , according to the India Bullion and Jewellers Association (IBJA). Silver exchange-traded funds (ETFs) have suffered more because they were trading at a higher premium. The two biggest silver ETFS by assets, Nippon Silver Bees and ICICI Prudential Silver ETF, have fallen 17% and 16%, respectively, sin...