Red rather than pink according to what Tjia posted above. And yes, isolated rooms seem to be rather common in a few countries, ignoring the fact that it's almost impossible to have a room without exposed earth potential these days (radiators, satellite TV wiring shields, network cables etc. etc.).
The basic idea was that in a room without exposed earth potential it's impossible to receive a fatal shock even if something becomes live at 230 V. Therefore, class-0 appliances are legal (devices containing single-insulated live conductors and other parts, not earthed) and class-1 appliances simply become class-0. The concept existed in Austria and Germany until 1958 but continued to be used much longer, e.g. in Sweden (1995) and is still in use in some countries, e.g. France, the Netherlands and Morocco. Not sure about Romania and Russia.
Another atrocity you never had in the UK is TN-C, i.e. a PEN in the entire installation with neutral/earth jumpers at every socket and light. Factor in 2.5 mm2 Al wiring and things get REALLY nasty! This method was banned in the 70s in most countries west of the Iron Curtain but used much longer on the eastern side.
