Decomposition of hydrogen peroxide by the catalyst iron(III)chloride

The image shows a colourless solution of hydrogen peroxide. Click to see what happens when an iron chloride(III) solution has been added!

After adding a solution of iron(III) chloride : $2H_2O_2$ $\longrightarrow $ $ 2H_2O $ $+ $ $ O_2 $ Oxygen gas is liberated, iron(III) chloride is returned in full at the end of reaction (see colour!)