Gentleman Jack (80 proof) takes the Jack Daniel's formula for Tennessee whiskey and incorporates and extra step- a second charcoal mellowing AFTER it has been aged. The result? Well, Old No. 7 is fair copper and has a fireball candy spiciness on the tongue, along with a nutty taste. Gentleman Jack is much smoother, much softer, exhibiting more barrel and charcoal flavors, along with faint currant and hazelnut notes.