Tiffany Blue: opened 1837 as a fancy-goods store; the colour on the 1845 Blue Book; a 1906 New York newspaper line that the box is only given, never sold; a colour trademark since 1998
The Blue Book has been published every year since 1845.
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The post, as it ran
01TIFFANY'S BLUE BOX IS NOT FOR SALE. IN 1906 A NEW YORK NEWSPAPER WROTE THAT TIFFANY WILL ONLY GIVE IT TO YOU.
02TIFFANY OPENED IN 1837, AS A FANCY GOODS STORE.
03THE BLUE FIRST APPEARED IN 1845, ON THE COVER OF ITS BLUE BOOK CATALOGUE.
04SINCE 1998 THE COLOUR HAS BEEN A REGISTERED TRADEMARK.
05PANTONE MAKES IT AS A PRIVATE CUSTOM COLOUR, NUMBERED 1837 FOR THE YEAR TIFFANY WAS FOUNDED.