Purple haze 

Following the reconvened trial on remitter from the Full Court which ruled that expert evidence had been impermissibly excluded at first instance, Heerey J has ruled that Darrell Lea was not misrepresenting itself or its products as Cadbury products between 2000 and 2004 when it used a dark shade of purple for Christmas promotions ... 

Cadbury Schweppes Pty Ltd v Darrell Lea Chocolate Shops Pty Ltd (No 8) [2008] FCA 470.

Prof. Mark Davison waxes lyrical in support here., Lea Lewin goes into more detail here x

As I'm involved in the trade mark case, I won't comment further.