Chameleon water - Chameleon solution

Japanese: カメレオン水 - カメレオンすい(英語表記)chameleon solution
Chameleon water - Chameleon solution
Originally, it was a green aqueous solution of manganate MnO 4 2- . It is used as an analytical reagent. When diluted or made acidic, it produces permanganate MnO 4 - , which is reddish purple, but when made alkaline, it becomes manganate again and the solution turns green. This appearance changes easily, like the protective coloring of a chameleon, which is why it was given this name. In the medical and pharmaceutical fields, the reddish purple aqueous solution of potassium permanganate KMnO 4 is sometimes called chameleon water.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
元来は,マンガン酸塩MnO42-の緑色水溶液のこと。分析試薬として用いられる。希釈または酸性にすると過マンガン酸塩MnO4を生じ,赤紫色を呈するが,アルカリ性にすることにより,再びマンガン酸塩となって溶液は緑色となる。この様相が,あたかもカメレオンの保護色のように変化しやすいのでこの名称を与えられた。医・薬学の分野では,赤紫色の過マンガン酸カリウム水溶液KMnO4をカメレオン水と称することもある。

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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