For its boxes, Tiffany chose a shade of this primary color, recognized as a trademark today
... little blue 
box- Tiffany's uses a trademarked shade of robin's egg blue... [DOC] [TLE] Rules for Protecting Your Brand's Color, in Black and White | Guest ... [PAR] Apr 23, 2012 ... Until the 1980s, U.S. law refused to recognize a single color as a brand ... use of 
one shade of a primary color infringed another's shade.