Do George Dickel and Jack Daniel's add coloring to their whiskey or is it the natural color from the aging process?

Neither George Dickel nor Jack Daniel's add coloring to their whiskey. As you may suspect following the distillation and charcoal filtering (a necessary additional step to make a Tennessee whiskey) processes, both of these whiskeys are virtually colorless. The whiskey is then aged in charred white oak barrels for several years (the actual number depends both on the brand and the number of the whiskey being sold). It is during this aging process that the whiskey acquires its soft caramel color.