Tea Knowledge
Four Infusion Flavour Map
A four-infusion flavour map becomes easier when the tasting purpose and brewing conditions are clear. This guide turns flavour changes across infusions into a practical four-infusion observation chart. There is no need to find an impressive answer immediately. Put the conditions, observations and next comparison on one page. That small courtesy prevents the next taster from solving a mystery during the busiest part of the day.
Create checkable fields
Record the date, version, product or batch, then add the quantities, materials, equipment, dimensions, languages and owners that matter. Mark each item confirmed, pending or not applicable; an empty cell should not quietly become approval. Beside every important fact, note whether it came from a package, supplier, authority or observation and when it was checked. A concise record can still show which question each fact answers.
Compare one point at a time
When a comparison is needed, hold the other conditions as steady as practical and change one variable. Put two or three options side by side and write their use, advantage, limitation and next action. Do not let the word best do all the work. If a trial, document or current specification is missing, list it as a check and arrange a small test or ask the responsible party before making a larger commitment.
Keep story and evidence separate
A photograph, name, flavour description or brand story can be a useful clue, but each supports a different conclusion. Origin, processing, safety, environmental, rights and partnership claims should return to applicable labels, records and primary sources. Keep the jurisdiction, date and conditions of official information visible. Evidence from one place, product or study should not be stretched to every case simply because the sentence sounds convenient.
Run a handover test
Give the sheet to someone who was not part of the earlier discussion. Ask that person to find the purpose, current version, completed items, next action and owner. If the answer requires three follow-up questions, simplify the order or remove duplication. For an exception, isolate it where appropriate, record what happened and send it to the right person rather than inventing a missing answer under time pressure. It is a useful note to your future self.
Questions that prevent confusion
Must every detail appear publicly? No. Readers need relevant product and use information; personal data, internal lists, quotes and undecided versions belong elsewhere. Can one photograph or phrase replace documentation? It may begin a question but rarely finishes it. Pause when food safety, law, copyright, testing, environmental claims or high-value collecting is involved and the available evidence is not enough.
Leave a clear next step
After the four-infusion observation chart is complete, note which brewing condition to repeat or change, then archive outdated versions. Continue with a related ABoxTik guide and another practical article, checking current labels and actual needs. A tasting sheet is not there to make tea bureaucratic; it lets the thoughtful details survive a busy day.
Put the chart into a real tasting
Start with one tea and one repeatable four-infusion session. Record the batch, leaf and water amounts, vessel, water temperature, infusion times and the decision that must actually be made. Give the chart to a colleague or household member and ask that person to repeat one comparison without an explanation. Note where the taster pauses, which scale term needs clarification and which brewing fact appears in the wrong place. This is not a test of the taster; it is a test of whether the record can work on a busy day.
In the second revision, keep necessary fields, remove repeated reminders and move the most error-prone condition closer to the beginning. Separate records from different batches, vessels or temperatures instead of combining them into one curve that looks neat but no longer describes a single case.
Write the judgement as repeatable steps
Use the first session as a baseline, change one brewing condition in the second, and decide after that whether another comparison is useful. Put aroma, body, sweetness and astringency in observation rows. Put leaf amount, water, temperature and time in a brewing record. Both parts matter, but neither should impersonate the other. When a result applies only to one batch, vessel or trial condition, write that scope beside the conclusion rather than hiding it in a distant note.
Before closing the chart, ask four questions. Which comparison does this record support? Are the brewing conditions complete? Does each score use the same anchor? Can another person repeat the process? When all four have an answer, archive the older version. It sounds like one extra step, yet it prevents many small episodes of “I thought you knew” and turns considerate service into useful detail.
One final check: keep the record with the real object
Before handover, storage or use, compare the sheet with the actual item once more. Check the name, version, quantity, date, language and owner. If information will be separated from its original package, keep the necessary details with the item in a form the next person can find. When a condition changes, update the master version and tell the person taking over. Finish with a short result and one next adjustment, so this experience becomes a useful starting point rather than a page everyone remembers seeing but nobody can find.
Draw a curve only after fixing the brewing record
A four-infusion map is useful when each point belongs to a clearly described brew. Record tea and batch, leaf amount, water amount, vessel, water temperature, the timer start, infusion time and whether the liquor was fully decanted. If one round used cooler water or remained in the pot longer, mark that change beside the point. Otherwise a beautiful curve may simply be charting four different methods.
Choose a few axes and define them
| Axis | 0 | 3 | 5 |
|---|---|---|---|
| Aroma intensity | Not noticed by this method | Clearly present | Dominant |
| Body | Very light | Moderate | Very full |
| Sweet impression | Not noticed | Clear | Dominant |
| Astringency | Not noticed | Clear drying sensation | Dominant drying sensation |
These are example anchors, not universal quality grades. A high astringency number does not automatically mean poor tea, and a low aroma-intensity number in the fourth infusion does not erase the earlier cups. ISO 4121 distinguishes quantitative response scales used in sensory assessment; write whether the number represents intensity, preference or quality, and do not swap meanings halfway through the chart.
Give every point one sentence
Beside each score, add a short observation: “first infusion: roasted note leads; leaves only partly open”, “second: floral cue clearer and body fuller”, “third: sweetness remains while aroma softens”, or “fourth: lighter liquor, clean finish”. The Taiwan Tea and Beverage Research Station describes tea assessment through appearance, liquor colour, aroma, taste and infused leaf. Looking at the infused leaves between rounds can therefore add context without pretending that leaf appearance alone proves flavour.
Plot the four infusions
- Make columns for infusion 1–4 and rows for the chosen axes.
- Use the same scale anchors for all four rounds.
- Connect each axis across the four infusions, or use separate small lines so the chart stays readable.
- Write the brewing record and one observation below each column.
- Circle any changed condition; do not smooth it away.
ISO 3103 provides a defined preparation method for sensory tests. A home four-infusion exercise does not have to copy that method; the useful principle is that comparisons become clearer when preparation is stated and repeatable.
Read the shape without declaring a winner
A rising second point may reflect leaves opening, while a later decline may reflect extraction under that specific method. It does not prove that every package of the tea follows the same path. Repeat the exercise on another day before treating one line as a stable profile. If the fourth cup is too light for your purpose, note it honestly; there is no prize for forcing four heroic infusions from a tea that already said goodnight.
Sources
TBRI — tea sensory evaluation · ISO 4121 — quantitative response scales · ISO 3103 — tea liquor for sensory tests