Where does color in my Whisky come from?

Whisky gets its color primarily from aging in wooden barrels, typically oak. As whisky matures, it interacts with the wood, extracting compounds like tannins and lignins that contribute to its color. 

The aging process also involves oxidation and evaporation, which further influences the whisky's hue. 

The type of barrel—whether it’s new or previously used for sherry, wine, or bourbon—also affects the color. 

New barrels impart a deeper, richer color, while used barrels contribute lighter, subtler hues. 

Additionally, some whiskies may have caramel coloring added to standardize their appearance.

This particular whisky and barrel is something I am ageing at home myself for last 3+ years

It has been slowly changing both in color and gaining great flavor/smell