Can oxidation change the taste of homemade liqueurs?

Expanded Explanation

Yes — oxidation is one of the biggest drivers of flavor change in homemade liqueurs. Oxygen can dull fresh fruit top notes, shift bright citrus into a more marmalade-like direction, and push delicate botanicals toward flatter, woody, or slightly stale notes. It can also darken color over time, especially in fruit and spice-heavy infusions.

Oxidation usually accelerates when there’s lots of headspace in the bottle, frequent opening, warm storage, or poor closures. Even if the liqueur stays safe to drink, the flavor can drift away from what you intended.

To slow it down: bottle with minimal headspace, use reliable caps/gaskets, store cool and dark, and avoid repeatedly “checking” the bottle. If a batch tastes a bit oxidized, blending with a fresher batch, adding a small fresh citrus peel infusion, or brightening with a tiny acid addition can sometimes bring back life — but prevention is far easier than rescue.