Next time you’re sitting in a new Cadillac, take a good whiff. The sweet leather aroma you smell has a name – and its recipe is considered a trade secret, like the formula for Coca Cola. It’s called “Nuance,” and it was painstakingly developed and tested in the late 1980s and early 1990s, finally making it into production in 1992. It’s been helping define the Cadillac brand ever since, just like the fragrant – but very different-smelling – Connolly Leather, which has defined the interiors ...

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