Bleached ginger is treated with

Bleached ginger is treated with Lime solution.
Bleached ginger is produced by dipping scrapped fresh ginger in a slurry of slaked lime, Ca(OH)₂, (1 kg of slaked lime/120 kg of water) followed by sun drying. As the water adhering to the rhizomes dry, the ginger is again dipped in the slurry. This process is repeated until the rhizomes become uniformly white in colour.
Liming gives ginger a better appearance and less susceptibility to the attack of insect pests during storage and shipping.