How to trademark a colour

A number of companies a have trademarked single colours. 

• In 1998, Tiffany & Co. trademarked its famous blue, and UPS trademarked its “Pullman Brown.”
•  3M secured its signature canary yellow colour for its Post-it notes.
• Deutsche Telekom AG protected T-Mobile’s famous magenta, and Fiskars has one for orange scissor handles.
• The Wiffle Ball, Inc. has a trademark on yellow for use in bats.
• The University of Texas at Austin (Pantone 159) and The University of North Carolina at Chapel Hill (Pantone 542) both have protections on their school colours.