Is it acceptable for a brand to trademark a colour?

Colour plays such an essential role in the identity of a brand. Think of the blue used in the Facebook logo, Caterpillars yellow or Home Depots orange. Then there's Coca Cola's red that's such a strong identity that it even managed to change the colour of Santa clause! But with this in mind, should these company's be allowed to own that specific colour?

The confectionary company Cadbury lost a five year court battle to register their disti...
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