How to keep a fermentation journal
Memory likes shortcuts. A journal preserves details that can later become essential.
Before you start
Give the batch a short code, such as K01. Record the date, recipe source, ingredients and masses. Frame one question that your notes should help answer. This makes it easier to decide what actually needs observing.
Observation is not explanation
“Bubbles are visible at the surface” is a description. “All bacteria are working correctly” is a conclusion that description does not support. Separate what you see from what you infer. Take photographs from a similar angle and date them.
Compare like with like
Record actual time, temperature and method. Note changes in the instrument or sampling approach. Two batches may differ in many ways at once; a single comparison does not establish which difference caused an effect.
Finish with three sentences
What was observed? Which explanation fits the data? What still needs checking? Include limitations: missing measurements, few samples or conditions that cannot be compared. Follow your laboratory’s rules in class; keeping a journal does not require growing unknown microorganisms at home.