All halogens are at least partially soluble in water, though it is difficult to identify aqueous solutions of Br2 and I2 from their colour. With an organic solvent (such as cyclohexane) there producue distinctive colours:
- F2: Pale yellow/green gas. Pale yellow/green in water. Colourless in cyclohexane.
- Cl2: Pale green gas. Pale green in water. Pale green in cyclohaxane
- Br2: Orange liquid. Orange in water. Orange in cyclohexane.
- I2: Black solid. Brown in water. Violet in cyclohexane.
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