date:Nov 01, 2012
and can often give a clue as to the type of cask - sherry or bourbon - used to age it.
The addition of legal spirit caramel is also sometimes used to darken the alcohol.
Jack Daniel's has hinted that it has also been experimenting with an aged rye expression, but as yet, there are no plans to go to market.
Mr Arnett added: 'Weve produced just a little bit to experiment around and let some mature in case should this be a long term offering.