Rice husk (Umi in Malayalam)is made from the milling processes of removing the coatings of rice. It is used as fertilizer and biofuel. and also charcoal from burning rice husk can be used as toothpaste (Umikkari in Malayalam). It is also used for poojas. A thattan (Goldsmith) sits with an earthen bowl in front of him with burning rice husk (Umi) and a bamboo pipe to blow the flameless fire in which the gold is shaped.😊