Cadbury Trademarks the color purple, and they're not alone

Cadbury Limited of Bournville, Birmingham in the United Kingdom ('Cadbury')
applied on 25 November 1998 to register the trade mark described as follows:
The trade mark consists of the colour PURPLE the said trade mark being
adopted as the substantial colour of packaging used in relation to the
nominated goods.
The colour is the shades of purple corresponding to the following
references in the 1997-1998 PANTONE â Colour Formula Guide:
2597c, 2607c, 2617c, 2627c, 266c, 267c, 268c, 269c, 2685c, 2695c, 273c,
274c, Violet C, 2735c, 2745c and 2755c
The goods covered by the application are:
Class: 30 Chocolate and chocolate confectionery