Which company famously spent millions to develop their signature 'robin egg blue' color (Pantone 1837), eventually trademarking it as part of their brand identity?

In the world of retail and product design, color choices can make or break a brand's identity and recognition. Some revolutionary color decisions have become so iconic that they've been legally protected as trademarks. Test your knowledge about one famous company that made a bold color choice that transformed their brand identity and revolutionized how we think about product design and visual merchandising.

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Tiffany & Co.
Apple
Coca-Cola
IBM