Spot rubber prices were in a mixed mood on Tuesday. RSS 4 finished flat at ₹121 a kg, according to traders and the Rubber Board. But ISNR 20 and Latex improved further on enquires from certain major consuming industries during late trading hours. RSS 3 (spot) inched up to ₹117.84 (117.75) at Bangkok. Spot rubber rates (₹/kg) were: RSS-4: 121 (121); RSS-5: 119 (119); ISNR 20: 115 (114) and Latex (60% drc): 85.50 (84.50).