The fermentation lab notebook in public

Make fermentation decisions from evidence, not memory.

Practical notes for cider, mead, fruit wine, and grape wine—built around measurements, real decisions, and repeatable results.

Start a batch Explore the lab notebook

Measure it.Log it.Learn from it.Repeat.

Glass carboy of amber cider beside a hydrometer cylinder and an open notebook on a wooden worktable — Editorial illustration · Generated for Fermenstein

Real batchesInstrument-aware measurementsVisible uncertaintyRepeatable decisions

Choose your next question

Four ways into the notebook

Useful answers first. Product actions only when they fit the work in front of you.

Measure

Turn readings into decisions

Understand SG, Brix, pH, temperature, and what each instrument can actually tell you.

Explore measure

Make

Build a repeatable batch

Use formulations with explicit targets, checkpoints, and honest testing status.

Diagnose

Check before you correct

Start with the symptom, rule out the dangerous cases, then act with limits.

Explore diagnose

Improve

Learn from real outcomes

Follow batch timelines, decisions, mistakes, and what changes next time.

Explore improve

From the field journalNew · Beginner cider

First batch

Our first homemade cider.

Just over 1.3 gallons of apple juice, a packet of wine yeast, and two weeks of observation—an approachable first batch and the lessons it left behind.

Read the field note