9.2 Roasted Coffee Inspection & Quakers

Some defects only appear after roasting. The most important is the quaker: a pale bean that stands out against its properly browned neighbors. Quakers matter to Q Graders in two places — green grading, where their cause is counted, and cupping, where their flavor shows up.

What a quaker is

A quaker is a bean that fails to brown normally during roasting. The usual cause is immaturity: cherries picked before they ripened, or seeds that did not fill properly because the tree was stressed. Immature seeds lack the sugars and amino acids that drive Maillard browning and caramelization, so they stay pale while the rest of the batch develops.

The link to green grading

Quakers are mostly a roasted expression of immature green beans. The CVA Physical Form counts Immature/Unripe beans as a Category 2 defect at 5:1. Floaters — light, under-dense beans — are also counted at 5:1 and can likewise roast unevenly. Careful sorting at the wet mill, such as flotation and removing unripe cherries, reduces quakers before the coffee ever reaches a lab.

How heritage grading treated quakers

The heritage SCA Washed Arabica Grading Form had two parts: a 350 g green defect count and a 100 g roasted sample in which quakers were counted. The heritage classification used them as follows:

These thresholds still appear in contracts and lab manuals, so learn them. The CVA Physical Form itself records green attributes and has no quaker field.

Quakers in the cup under the CVA

A quaker ground into one cup typically adds grainy, cereal, peanut-like, or papery notes and may add astringency or a drying finish. On the CVA forms:

• Descriptive: record what you perceive, for example Roasted → Cereal, Nutty, or Green/Vegetative, plus freely written words such as "peanut skin."
• Affective: let the flavor lower your impression of quality in the sections where it appears, such as flavor, aftertaste, or mouthfeel.
• Uniformity: if only one cup shows the quaker character, that cup differs qualitatively from the others and can be marked non-uniform (−2 points).
• Defects: a quaker flavor is not one of SCA-104's sensory defects. Those are limited to potato, moldy, and phenolic, so do not mark it as a defective cup.

This is a frequent exam trap. In the heritage form, cuppers sometimes treated quaker cups as "taints." In the CVA they are a uniformity and impression-of-quality issue, not a defect.

Other roasted-bean faults

Some roasted-bean faults come from the roasting machine rather than the green coffee. They are useful to recognize when you inspect your own sample roasts:

If you see these faults on a sample roast, roast the sample again. They introduce roast character that SCA-102 tries to keep out of the assessment.

Practical inspection routine

1. Spread a roasted sample on a tray in good light.
2. Pick out every bean noticeably paler than the rest and check the features in the table above.
3. Crush a doubtful bean and smell it; a grainy, peanut-like aroma supports a quaker.
4. Record the count if your lab uses the heritage 100 g method.
5. Before cupping, decide whether to remove quakers. For CVA assessment, follow your lab's rule and note it, so others know what the cups represent.

Why this matters for Q Graders

Quakers connect three skills: green grading (immature beans), roasting (failure to brown), and cupping (grainy flavor and non-uniform cups). Seeing that chain lets you trace a cup problem back to its source and advise producers and buyers correctly.

A worked scenario

A Q Grader cups five cups of a natural coffee. Cups 1, 2, 4, and 5 are clean, sweet, and fruity. Cup 3 has a grainy, peanut-skin note and a drying finish. On inspection, the roasted sample contains several pale, wrinkled beans.

• Descriptive Form: note Cereal and Nutty for the coffee only if they characterize it overall. Write "peanut skin in one cup" as a free descriptor.
• Affective Form: mark cup 3 as non-uniform (u = 1). Do not mark a defect, and let the flavor influence the relevant section ratings only as far as it affects your overall impression.
• Feedback: report the likely cause — immature beans in the green coffee — so that the supplier can review sorting at the mill.