“….unconventional or “exotic” marks, such as colours, sounds and smells, give rise to conceptual problems, which are not encountered with more conventional trade names and logos. As the registration of a trade mark creates a form of intellectual property conferring a potentially perpetual monopoly in the mark and excluding everybody else from use in various ways, the point of principle has some public importance.”
Recently, the England and Wales Court of Appeal in the case of Société Des Produits Nestlé S.A. v Cadbury UK Ltd.  overturned a decision of the High Court to proceed with an application to register a trade mark for Cadbury’s chocolate, which featured a specified shade of the colour purple. In particular, the trade mark applied for by Cadbury was shown as a rectangle, which is a purple block when reproduced in colour, and described as:-
“The colour purple (Pantone 2685C), as shown on the form of application, applied to the whole visible surface, or being the predominant colour applied to the whole visible surface, of the packaging of the goods.” [Emphasis Mine]
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