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Coffee education

Green coffee appearance, screen size and defects: three checks before buying

A clean-looking sample is a starting point, not a cup-quality guarantee. The SCA separates physical assessment—colour, defects, moisture and size—from sensory assessment. Screen analysis describes bean-size distribution; defect assessment describes physical faults. They answer different questions and should accompany a representative sample and cupping.

A practical sample checklist

  • Identify the lot, crop and process; record the sample date and weight.
  • Inspect colour, uneven appearance and foreign material under consistent lighting; record unusual odours.
  • Request a screen distribution and the allowed undersize proportion, not only one screen number.
  • Record defect types and counts using the agreed grading method and sample weight; do not compare unlike systems.
  • Measure moisture and assess the roasted sample by cupping; appearance alone cannot establish flavour.
  • Match the accepted sample and measurable tolerances to the written offer.

Atlas buyer interpretation

For Oman, UAE and Iran buyers, compare offers on the same testing basis. A larger bean is not automatically a better purchase. Send your sourcing requirements through the website contact section; the form prepares a WhatsApp message that you review and send.

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SCA Coffee Value Assessment — physical and sensory assessment (checked 1 October 2026)

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