Which company was the first to legally trademark a specific color as part of their brand identity?

Throughout history, certain brand colors have become so iconic that they revolutionized product marketing and became protected intellectual property. Some color combinations are so distinctive that they're instantly recognizable worldwide, while others were scientifically developed to trigger specific consumer responses. Test your knowledge about these famous chromatic inventions that shaped brand identity in the modern marketplace!

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Tiffany & Co. with their robin's egg blue (1998)
Owens-Corning with their pink fiberglass insulation (1985)
Cadbury with their distinctive purple chocolate packaging (1995)
UPS with their Pullman Brown delivery trucks (1991)