Latest Posts

  1. The New Green Deal

    The New Green Deal

    It's New. It's a great deal. The coffee is green. The New Green Deal.

    Read More
  2. Sweet Maria's Green Coffee Sample Sets

    Sweet Maria's Green Coffee Sample Sets

    The ultimate order-ahead-of-time pre-holiday non-procrastinator stocking-stuffer

    Read More
  3. Happy Halloween. Here's Six Under Six

    Happy Halloween. Here's Six Under Six

    Read More
  4. Not Another Fruit Cake! (and what to do about holiday blending?)

    Not Another Fruit Cake! (and what to do about holiday blending?)

    Read More
  5. Sumatran Coffee: Grading and Appearance

    Sumatran Coffee: Grading and Appearance

    The appearance of green coffee from Indonesia can be jarring, especially if you’re used to washed beans from Africa or Central America. Why, many ask, does a Grade 1 Sumatra lack uniformity of color and/or bean size?

    Read More
  6. The Golden Bean Bronze Medal Bullet Profile

    The Golden Bean Bronze Medal Bullet Profile

    Check out Julio's award winning profile.

    Read More
  7. Roasting Flores Gunung Gedha on a Popcorn Popper and Quest M3s

    Roasting Flores Gunung Gedha on a Popcorn Popper and Quest M3s

    Read More
  8. Podcast Episode #25: The Global Trade/Burundi Discussion

    Podcast Episode #25: The Global Trade/Burundi Discussion

    Some very informative audio from last month's discussion

    Read More
  9. The Flores Factor

    The Flores Factor

    Crowd pleasing coffee from a promising origin.

    Read More
  10. Six under Six - July 2019

    Six under Six - July 2019

    Six delicious coffees for under six dollars.

    Read More
  11. 20% Off Guatemala Sale - Check Out Our "Cheat Sheet" Overview

    20% Off Guatemala Sale - Check Out Our "Cheat Sheet" Overview

    Take advantage of this great discount on these crowd-pleasing coffees.

    Read More
  12. A Second Look at 4 Ethiopian Coffees

    A Second Look at 4 Ethiopian Coffees

    We took a second look (and taste!) at 4 Ethiopian coffees from our 20% off sale.

    Read More

Coffee Damage under UV Light

Coffee Damage under UV Light

Coffee Damage under UV Light, originally uploaded by sweetmarias.

Ultraviolet light is useful to see problems with coffee like mold and bacteria, but these are things that affect low grade lots that are already quite damaged. However, when I suspect drying problems with coffee, I check it out anyway. Some recent Sulawesi wet-hulled lots have been very surprising under UV light, and in general UV shows the problems with the wet-hull process overall (although our Blue Batak Sumatras fare well under UV light. This was a surprise. An Ecuador
Cariamanga lot with a nice cup, but some odd off notes cropping up way too often. The green coffee loots PERFECT. But under UV light, small nicks, little marks were I suspect the pulper scraped against the coffee seed due to misadjustment. Then in fermentation the damaged areas are in contact with mucilage and bacteria, rather than being protected by the parchment layer. The result is some off cups, but mysterious since there was little clue under normal light. I
could not get the coffee to "light up" completely under UV for the photo so the arrows assist in seeing the glowing areas, and then the 1 little pulper kiss marks can be seen.
--
-Tom

Comments