| 摘要 |
A checker which comprises potassium iodide, thiosulfate ion, and starch, wherein a weight ratio of the potassium iodide and the thiosulfate ion (potassium iodide/thiosulfate ion) is 0.70 to 0.3; and a kit comprising two or more of the aforementioned checkers, wherein the aforementioned weight ratio is different between said checkers are provided. The checker or the kit easily and precisely determines whether or not the concentration of an organic carboxylic acid peroxide such as peracetic acid in an aqueous composition for sterilization comprising the organic carboxylic acid peroxide as an active ingredient is an effective concentration.
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