Rice husks are the seeds of rice or the protective layer of grains. The husk protects the seeds during the growing season because it is made of hard materials, including opalescent silica and lignin.Rice husks are mostly indigestible to humans.
Winnowing, used to separate the rice from the hull, is to put the whole rice into a pot and blow the wind into the air.The light husks are blown away and the rice is poured into the pot.Later rice pestle and a simple machine called a rice tamper were developed to remove rice husks.The modern thresher was invented in Brazil in 1885.During the grinding process, the shell is removed from the raw grain to reveal the whole brown rice, which can then sometimes be ground to remove the chaff, resulting in white rice.
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