Bleaching powder (English spelling)

Japanese: さらし粉(晒粉) - さらしこ(英語表記)bleaching powder
Bleaching powder (English spelling)
Also called bleaching powder or chlorine. It is a white powder whose active ingredient is calcium hypochlorite, and dissolves well in alcohol and water. It has a pungent odor similar to chlorine, and has a strong oxidative bleaching effect along with sodium hypochlorite and sodium chlorite. For this reason, bleaching powder is generally used as a bleaching agent and disinfectant. The main component of bleaching powder is Ca(OCl) 2 ·CaCl 2 ·2H 2 O, and the amount of available chlorine that performs the oxidative effect of this pure substance is 48.9%, but actual industrial products contain a solid solution of Ca(OCl) 2 , CaCl 2 , Ca(ClO 3 ) 2 , and H 2 O, as well as slaked lime, so the amount of available chlorine is 33-38%, and the Japanese Pharmacopoeia, food additives, and JIS Class 1 specify that it must contain more than 30%.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
漂白粉,カルキともいう。次亜塩素酸カルシウムを有効成分とする白色粉末で,アルコールや水によく溶ける。塩素に似た刺激臭を放ち,次亜塩素酸ナトリウム,亜塩素酸ナトリウムなどとともに強い酸化漂白作用をもつ。そのため,さらし粉は一般に漂白剤,殺菌剤として用いられる。さらし粉の主成分の組成はCa(OCl)2・CaCl2・2H2Oであり,この純粋な物質の酸化作用を営む有効な塩素量は48.9%であるが,実際の工業製品にはCa(OCl)2,CaCl2,Ca(ClO3)2,H2Oからなる固溶体と消石灰が含まれるため,有効塩素量は33~38%で,日本薬局方,食品添加物およびJIS1級では,30%以上含むことと規定されている。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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