Part of the Beer Mastery school. Class 4 of 6.
The capability: you can taste hop fade and you know why the date code did not warn you.
Prerequisites: Modules 15, 30.
The practice
Taste a fresh IPA against one two months old. The demonstration, and it is the only way to learn what fade tastes like.
Then taste a light lager, a stout, and an IPA all at the same age and notice which shows it.
Then check the storage. Is it cold from receiving, or cold from when it reached the shelf?
And audit list length against velocity. Anything selling under a keg a month is a purchasing problem, per Module 30.
The reference
The fresh version. Without it, a faded beer reads as "fine, maybe a little dull" — which is exactly what a bartender says when they do not have the reference.
What you are building
The separation between shelf life and quality window.
A date code is a shelf-life limit and for hop-forward beer the two are far apart — which means a beer can be entirely sound, safe, and legal and have lost most of what made it worth ordering.
And the conclusion that follows: a regular who says an IPA tastes off within its date code is right, and the code was answering a different question.
Verification and boundary
Blind: identify the older sample in a pair.
Boundary: storage and sanitation are governed by the local health authority.