If you really had pure ozone, then you would have seen a blue gas. Ozone has a clearly visible blue color. Colored gases can easily be observed if
they are present in high concentration (e.g. Cl2, NO2, ONCl, ClO2) and ozone is not an exception to this. But in practical situations, the 'pure
ozone' is at most a few tenths of percent of ozone and then you don't see anything of the gas.
Liquid ozone must be quite spectacular to see and is said to have a deep dark blue color, but I have never seen any of this. |