Colour of Halogens in...

The colour of halogens in aqueous solution and 1,1,1-trichloroethane. Their colour changes slightly with concentration.
The presence of halogens can be confirmed using organic solvent eg 1,1,1-trichloroethane.
The layer of 1,1,1-trichloroethane will be at the bottom because it is denser, while the less dense aqueous layer will be at the top.

在 F5 第三课 Oxidation & Reduction 的 Displacement of halogens 提到的~
若只是把 halogen溶解在水中，我们比较难分辨谁是谁，所以会加 organic solvent 下去，不同 Halogen 的颜色就一目了然。不同参考书的资料也许会有些许不同，因为他们的颜色会受浓度影响而有所不同。^^ 下面那层是 1,1,1 - trichloroethane。

Chlorine
in solution: Pale yellow
in 1,1,1-trichloroethane: Pale yellow to colourless

Bromine
in solution: Reddish-brown
in 1,1,1-trichloroethane: Reddish-brown

Iodine
in solution: Yellowish brown
in 1,1,1-trichloroethane: Purple

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9月中画的……感觉好久没来这儿了所以来发张图^^
画是自己的，不过用试管来表达不同元素特征的这个构思沿用自网络。如有侵权，请告知我，会立即将之删除并致歉。