Latest Posts

  1. Rwanda Mutovu Video Tour: Incremental Improvements, a Competition-Level Cup

    Rwanda Mutovu Video Tour: Incremental Improvements, a Competition-Level Cup

    Small improvements at Rwanda Mutovu washing station has led to a consistent, competition-level coffee.

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  2. Sweet Maria's Staff Picks: Featuring Ryan

    Sweet Maria's Staff Picks: Featuring Ryan

    ...because we have our favorites too.

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  3. 2020 Rwanda Kageyo: Fresh Coffee and a Fresh Infrastructure Project

    2020 Rwanda Kageyo: Fresh Coffee and a Fresh Infrastructure Project

    We're helping fund a buildout at the Kageyo station and you can help too!

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  4. Our Sourcing in Honduras

    Our Sourcing in Honduras

    While we may have struggled to find a consistent source in Honduras, we continue to come up with good coffee. Find out how.

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  5. The New Green Deal

    The New Green Deal

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

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  6. 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

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  7. Happy Halloween. Here's Six Under Six

    Happy Halloween. Here's Six Under Six

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

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

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  9. 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?

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  10. The Golden Bean Bronze Medal Bullet Profile

    The Golden Bean Bronze Medal Bullet Profile

    Check out Julio's award winning profile.

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  11. Roasting Flores Gunung Gedha on a Popcorn Popper and Quest M3s

    Roasting Flores Gunung Gedha on a Popcorn Popper and Quest M3s

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  12. 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

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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

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