Research note summary

A crop-year sensitivity case showing how white peach identity can disappear when a coffee falls below its confirmed cup reference window.

Archive role

Research Notes case or observation record.

Ontology status

Not a term. Routes case observations back to defined terms.

Note type

case-study

Related terms

AC | Alive Cup, OP | Observation Progression, CDM | Cup-Driven Maturity, CICC

Primary observer

SUNNY M Lab

Crop-Year Sensitivity and Cup-Driven Correction

Batch references:

Colombia / El Paraiso Lychee Peach / 080
Colombia / El Paraiso Lychee Peach / 936
Colombia / El Paraiso Lychee Peach / 950

Related phenomena: AC, OP, CDM

Boundary condition: approaching CICC-type structural loss at the cool stage

Research status: correction direction identified. New-crop re-roast pending.

The confirmed reference batch for this coffee has a very clear sensory identity: white peach tea, carried by a light coffee texture.

When the roast is correct, the white peach does not need to be explained. It appears on its own. It can be recognized from the first hot sip and continues to hold in the cup, becoming the clearest identifying feature of this coffee.

This record began as a simple old-crop versus new-crop comparison.

The question was direct: if the old crop and the new crop are handled under the same conditions, what will the cup tell us?

The result was not as simple as “the new crop is better” or “the old crop is better.”

Both the old crop and the new crop landed below the confirmed reference window, but they did not fail in the same way. The old crop still retained part of its white peach identity. The body was thinner than expected, and the sweetness did not fully reach the level of the reference batch, but the fruit identity still partially held.

The new crop behaved differently.

In the early observation window, its dry aroma was present and pleasant. But as observation progressed, the most important white peach character became clearly suppressed. By the later tasting stage, the floral and fruit expression had become quiet, and it did not resemble the natural progression expected in OP. Sweetness in the cool stage was insufficient, and structural completion was not enough.

That difference matters.

Crop-year change is not only a change in flavor intensity. It may also change how much tolerance a coffee has within a roasting window. Without using the confirmed reference structure, the new crop carried a larger sensory penalty than the old crop.

This does not mean the new crop is weaker.

It points to something more precise: the new crop may require higher precision in order to express the same sensory identity. The coffee did not lose its possibility. It lost the structural entry point through which the white peach could appear.

This is why SUNNY M Lab’s CDM, Cup-Driven Maturity, must use the cup as the final judge.

The appearance of this coffee can be misleading. As a Thermal Shock Washed Castillo, the surface may look mottled yellow-brown after a no-crack roast. For this coffee, that appearance cannot be treated directly as a defect, nor is it enough to judge the coffee as underdeveloped.

The cup is the judge.

When the roast is correct, the cup is vivid, complete, and clearly marked by white peach identity. When the window is not reached, the same coffee can become quiet, thin, or structurally incomplete.

The point of this record is not that one crop year is good and another is bad.

The real point is this: crop-year change can alter the tolerance of a coffee’s sensory structure. A setting that allows one crop year to partially express itself may suppress another crop year more severely.

The next step is not to make a final judgment about the farm, process, or crop year.

The next step is to confirm whether the white peach identity returns when the new crop is brought back to the reference structure. If it returns, the disappearance of peach in 950 was primarily a window issue. If it does not return, the hypothesis of crop-year or processing-batch variation becomes stronger.

For now, this remains a boundary observation.

The peach disappeared. The cup showed where to look.

Archive Links

• Finding the Window Without Crack
• When a Smooth Curve Still Fails
• When Energy Disappeared During the Roast
• Citation Policy