Colombia · Tolima · Washed · 1550-2,030 MASL · Excelso EP · John Burton

Colombia ASOSPAC COL03 Roast Log: Bright Filter at Level 2.4

What worked: Bright Filter at level 2.4, 100 g. The first good cup on it was roast 11 of 18; 14 of 18 roasts were tasted. Read how to roast Colombia ASOSPAC COL03

Goal: fruity bright18 roasts logged

Aroma of chocolate, molasses and spices. Flavours of dark chocolate, cranberry and raw sugar with a long caramelized almond aftertaste. Medium-high crisp acidity and medium coating body. Score: 83.75+

Best so far: Bright Filter at level 2.1, 120 g — tasted good 1 of 1 time.

The journey

  • Tasted good
  • Had a fault
  • Not tasted yet

What the roasts show

  1. Roast 1: Raost at level 2.2, 100 g. 1 with a fault (roasty).
  2. Then level 2.2 → 1.7, load 100 g → 110 g: roast 2. 1 with a fault (grassy).
  3. Then level 1.7 → 2.5, profile Raost → F-WSH 1000-1700: roast 3. 1 with a fault (grassy).
  4. Then level 2.5 → 1.8, profile F-WSH 1000-1700 → 9minFilter: roast 4. 1 good.
  5. Then level 1.8 → 1.7, load 110 g → 120 g: roasts 5–6. 1 good, 1 with a fault (grassy).
  6. Then level 1.7 → 2.5, profile 9minFilter → F-WSH 1500-2200: roast 7. 1 good.
  7. Then profile F-WSH 1500-2200 → Gentle Filter, load 120 g → 100 g: roast 8. 1 with a fault (roasty).
  8. Then level 2.5 → 2.0, profile Gentle Filter → Rich Filter: roast 9. 1 with a fault (roasty).
  9. Then level 2.0 → 2.6, profile Rich Filter → F-WSH 1500-2200, load 100 g → 120 g: roast 10. 1 with a fault (grassy).
  10. Then level 2.6 → 2.4, profile F-WSH 1500-2200 → Bright Filter, load 120 g → 100 g: roast 11. 1 good.
  11. Then level 2.4 → 2.2: roast 12. 1 good.
  12. Then level 2.2 → 2.0: roast 13. 1 not tasted.
  13. Then level 2.0 → 1.9: roast 14. 1 with a fault (grassy).
  14. Then level 1.9 → 2.1: roast 15. 1 not tasted.
  15. Then load 100 g → 120 g: roast 16. 1 good.
  16. Then load 120 g → 135 g: roast 17. 1 not tasted.
  17. Then load 135 g → 130 g: roast 18. 1 not tasted.
  • Weight lost: good roasts 14.2%–16.0%, roasts with a fault 14.3%–16.7%.
  • Time in the hot zone: good roasts 2:04–2:44, roasts with a fault 2:04–3:02.
  • End temperature: good roasts 212 °C–224 °C, roasts with a fault 214 °C–224 °C.
  • Good cups were tasted after 8–16 days of rest (6 tastings).
  • The first good cup on Bright Filter at level 2.4, 100 g was roast 11 of 18.

This shows what differed in the roast. It does not say why the cup tasted different.

Recipes tried

  • Bright Filter

    Still dialling in · 8 roasts · 2:37–2:44

    • 1.9 · 100 g · 1 roast, Had a fault
    • 2.0 · 100 g · 1 roast, Not tasted yet
    • 2.1 · 100 g · 1 roast, Not tasted yet
    • 2.1 · 120 g · 1 roast, Tasted good
    • 2.1 · 130 g · 1 roast, Not tasted yet
    • 2.1 · 135 g · 1 roast, Not tasted yet
    • 2.2 · 100 g · 1 roast, Tasted good
    • 2.4 · 100 g · 1 roast, Tasted good

  • F-WSH 1500-2200

    Moved on · 2 roasts · 2:04–2:07

    • 2.5 · 120 g · 1 roast, Tasted good
    • 2.6 · 120 g · 1 roast, Had a fault

  • Rich Filter

    Moved on · 1 roast · 3:02

    • 2.0 · 100 g · 1 roast, Had a fault

  • Gentle Filter

    Moved on · 1 roast · 2:30

    • 2.5 · 100 g · 1 roast, Had a fault

  • 9minFilter

    Moved on · 3 roasts · 2:10–2:21

    • 1.7 · 120 g · 2 roasts, Mixed results
    • 1.8 · 110 g · 1 roast, Tasted good

  • F-WSH 1000-1700

    Moved on · 1 roast · 2:04

    • 2.5 · 110 g · 1 roast, Had a fault

  • Raost

    Moved on · 2 roasts · 2:42

    • 1.7 · 110 g · 1 roast, Had a fault
    • 2.2 · 100 g · 1 roast, Had a fault

The recipe that stuck

Profile
Bright Filter
Level
2.4
Batch
100g
16%
2:43
End temperature
224°C
Winning batch
R-092 · 2026-07-09
nice and different. i've got a chocolaty note but also some fruit.

Compare two recipes

Comparewith
  • 1.9 points less weight lost (13.3% vs 15.2%)

No usable roast log for Bright Filter at level 2.1, 130 g, so hot zone and end temperature are not compared.

This shows what differed in the roast. It does not say why the cup tasted different.

What the roasts taught

  • Early Raost runs at high DTR tasted dark/roasty with no fruit — wrong family for a bright Colombian goal.
  • 9minFilter around level 1.7–1.8 / ~110–120g first unlocked clear fruit (R-034).
  • Latest sweet spot: Bright Filter at 2.4 / 100g — chocolate plus fruit; a tick lighter (2.2) is the current fine-tune.
  • Washed F-Series still sometimes brought green notes even when fruit showed — Bright Filter was cleaner for this lot.

Where the good cups live

Roast level against batch size. Colour is the profile; a larger dot is a roast that tasted good.

Roast mechanics across the roasts

Roast loss, hot zone and end temperature for each logged roast. Each line has its own scale, so compare shapes, not heights.

Roast goal

Roast to just before or at first crack completion to maximize the high-altitude fruit expression. Push the cranberry and red berry brightness to the forefront while retaining enough development to keep the caramel sweetness supportive rather than dominant. Accept a slightly lighter body in exchange for the vibrant, juicy acidity that defines the fruity character. The chocolate notes will shift toward cocoa powder rather than dark chocolate bar—lighter and more complementary to the fruit.

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