Why are glass jars recommended instead of wood or plastic for liqueur infusions?

Expanded Explanation

Glass jars are recommended for homemade liqueur infusions because glass is non-porous, stable, and easy to clean thoroughly. It does not absorb liquid, flavor compounds, oils, or microbes the way more porous materials can. That makes it much easier to start each batch in a controlled and hygienic environment.

Wood is not suitable for general long-term infusion storage because it can trap moisture and microorganisms inside tiny pores and cracks. Some plastics are also less ideal because they may scratch, retain aromas, or react poorly with high-proof alcohol over time. Even if a plastic container looks clean, fine surface damage can make full sanitizing more difficult.

A clean glass jar with a tight lid lets you monitor the infusion visually, sterilize effectively, and avoid unwanted flavor carryover between batches. For homemade liqueur making, that combination of cleanliness, neutrality, and visibility makes glass the most practical and safest choice.