Which company was the first to legally trademark a specific color as part of their brand identity, setting a precedent in product marketing and design?

In the world of inventions and discoveries, brand colors have played a crucial role in product recognition and market dominance. Some color schemes have become so iconic they're protected as intellectual property and have influenced entire industries. This trivia question explores how color innovation became intertwined with groundbreaking product development and changed consumer perception forever.

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Owens-Corning with their pink insulation (1985)
Tiffany & Co. with their robin's egg blue (1998)
John Deere with their green and yellow combination (1976)
Cadbury with their purple chocolate packaging (1995)