Hennessy Black, a spinoff of standard Hennessy cognac designed as a cocktail ingredient, is not black. It’s a dark gold color, much like any cognac you’re likely to encounter.
A blend of up to 45 eaux-de-vie, Hennessy Black is aged five years and dropped into a wholly opaque bottle designed to evoke the night.
Read more about the Hennessy Black on Cognac Wiki.