Study Guide
Exam Focus
- Hop flavor and aroma can diminish.
- Malt can shift toward honey, caramel, or toffee.
- Papery or wet-cardboard notes are common warning signs.
- Waxy or lipstick-like notes can indicate oxidation.
What to know
Oxidation can show as stale cardboard, paper, honey-like sweetness, muted hops, or dull malt.
How it applies
Warm storage, old inventory, oxygen exposure, or party-pumped kegs can speed oxidation, so servers should check dates, storage, and service method.
- Hop flavor and aroma can diminish.
- Malt can shift toward honey, caramel, or toffee.
- Papery or wet-cardboard notes are common warning signs.
- Waxy or lipstick-like notes can indicate oxidation.
Why It Matters
- Oxidation gives servers a practical checkpoint before beer reaches a guest.
- Knowing this topic prevents avoidable quality problems and supports clear guest communication.
Practical Sensory Exercises
Oxidation practice drill
Use this topic in a practical study rep: inspect the beer, list the relevant service or sensory cues, decide the correct action, and explain it in one clear guest-facing sentence.
Key Terms
- Oxidation
- Flavor change caused by oxygen exposure and age.
- Staling
- Loss of fresh beer character over time.
- Cardboard note
- A papery stale flavor commonly associated with oxidation.