Aroxa™ acetaldehyde (Cara Technologies)
“Acetaldehyde, like emulsion paint or green apples”
Certified beer flavor standard used to train professional beer tasters to recognize and scale the intensity of acetaldehyde character. Acetaldehyde is produced by yeast during fermentation. A positive note at low levels but an off-flavor at higher levels. It is indicative of fermentation problems or poor control of dissolved oxygen in packaging.