Incidentally, there is an expression "seihakudo" (degree of polishing rice), which shows the ratio of polished (scraped off) portion: the higher the value, the more the rice has been polished.
ちなみに精白度という呼び方もあるが、こちらは逆で磨いた割合を示すもので、数値が高いほど磨かれていることとなる。