碘酒存放过久 ,在光线的作用下 ,碘会还原成碘化氢或碘化烷 ,酒精被碘氧化变成乙烷、乙醛或乙酸 ,从而失去消毒作用。因此 ,碘酒在家庭的存放时间 ,一般以不超过半年为好。（摘自《贵州商报》）碘酒不宜久存 Iodine stored too long, under the action of light, iodine will be reduced to hydrogen iodide or iodine, alcohol is oxidized by iodine into ethane, acetaldehyde or acetic acid, thus losing the role of disinfection. Therefore, iodine in the family’s storage time, generally no more than six months as well. (From “Guizhou Daily”) Iodine should not be long-lasting