inspired by actual events, your humble blogger has decided to sort a random pound of coffee for defects, roast the defectless batch against a regular, other batch and cup the results. defects were culled using the scaa's defects poster as a guide.
so far the defect picking has been completed and here are the results. there were 72 defects in all, with the most common (38) defect being partial sours. the second most populous group were chipped, broken or partial beans (17), followed by peaberries (10). the rest comprised an amalgamation of the other cat 2 defects such as partial insect bites (1) and (very) partial black bean (2). the rest were unclear as to which category they neatly fit into, as their defectiveness was minor at best and displayed the markings of at least two defects on the list.
in all, there were no death knell defects to be found in the sample pound and this made me quite pleased. not that i expected to see any from this source whatsoever. only that it confirmed the presence of good beans. using the system for adding the defects, however, gave me a total of 12 full defects, which is 4 more than should be seen for premium grade and seven more than for specialty grade.
if i can get this camera in line with the macro lens i'll try for some up closes of the defects.
i'll also mention that in this randomly sampled pound i did not count beans with silverskin on them, something the scca poster indicates as a sign of immature or unripe beans. i didn't count these as defects because i have a pretty good foundation for believing that this source of beans is not picking immature or unripe beans, and because i rarely have any quakers in my batches of this coffee. i'm not sure what causes the silverskin to stay on--a sign of fermenting/drying practices that need to be tightened? i would venture that it's not a dry mill issue, as the beans are already at their necessary moisture content by that point. and i would assume it's not a pulping issue, as a pulper wouldn't remove silverskin anyway, the beans still being in pergomino. the only solution that seems left is fermentation tank/drying.
i digress. next post should be about the comparison cupping. maybe some defect pics.
ah yes, one more thing. while not on the scaa poster, technically a peaberry is a defect. i counted those ten in my defect total.
Labels: cupping, defects, roasting