The Untitled Architecture of Extraction Science
Extraction is not magic — it’s mass transfer physics governed by Fick’s Law, surface area, and solubility thresholds. When we say “untitled,” we’re referring to the invisible matrix of variables that determine whether your brew tastes balanced or bitter, thin or syrupy.
Total Dissolved Solids (TDS) and extraction yield (%) are the twin pillars. A TDS between 1.15–1.35% with an extraction yield of 18–22% typically delivers optimal sensory balance. Go beyond 22%, and quinic acid dominates — that’s where bitterness lives. Fall below 18%, and you’re under-extracting citric and malic acids, leaving sweetness and complexity on the table.
“The difference between ‘good’ and ‘great’ coffee lies in the 0.5% swing of extraction yield. Most home brewers never measure it — they guess. And guessing is why coffee remains ‘untitled’ to them.”
— Jim Morton, Liberty Beans Head Roastmaster
- Surface Area: Finer grinds increase surface area, accelerating extraction — but also increasing risk of over-extraction if flow rate isn’t controlled.
- Turbulence: Agitation during pour-over or immersion affects boundary layer diffusion — too much turbulence strips fines and creates sludge.
- Temperature Decay: Water cools as it contacts grounds. Starting at 96°C? By mid-brew, you may be at 89°C — enough to stall sugar dissolution.
Water Mineral Chemistry: The Silent Flavor Conductor
Your beans are only as good as your water. Magnesium ions unlock floral and fruity esters. Calcium enhances body and perceived sweetness. Bicarbonate buffers acidity — too much, and your bright Kenyan turns flat. Too little, and your Guatemalan becomes shrill.
| Mineral | Ideal Range (ppm) | Flavor Impact | Risk of Imbalance |
|---|---|---|---|
| Magnesium (Mg²⁺) | 10–30 ppm | Enhances brightness, fruit, florals | Too high = metallic sharpness |
| Calcium (Ca²⁺) | 30–60 ppm | Builds body, rounds mouthfeel | Too high = chalky texture |
| Bicarbonate (HCO₃⁻) | 40–70 ppm | Buffers acidity, stabilizes pH | Too high = dulls origin character |
| Sodium (Na⁺) | <10 ppm | Minimal impact | Too high = salty aftertaste |
Liberty Beans recommends Third Wave Water or DIY mineral packets calibrated to SCA Gold Cup standards. Never brew with distilled or reverse osmosis water — zero minerals means zero flavor extraction.
Roast Thermodynamics: Time, Temperature, and Transformation
Roasting isn’t browning — it’s controlled pyrolysis. At 165°C, sugars caramelize. At 196°C, Maillard reactions peak. At 205°C+, chlorogenic acids degrade into quinic acid — the root of bitterness. Our “untitled” roast profiles are timed to terminate development precisely at 12–14% weight loss, locking in volatile aromatics while minimizing acrid compounds.
“A roast curve is a symphony of heat application. Miss the first crack crescendo by 15 seconds, and you mute the citrus. Stretch development too long, and chocolate turns ashy. There’s no room for improvisation — only precision.”
— Jim Morton, Culinary Chef & Roast Scientist
Key Roast Milestones (for 100g Batch, Fluid Bed Roaster)
- Drying Phase (0–4 min): Bean temp climbs from ambient to 150°C. Moisture evaporates — no flavor development yet.
- Maillard Phase (4–7 min): 150–190°C. Sugars + amino acids form melanoidins — nutty, caramel, toasted notes emerge.
- First Crack (7:30–8:15 min): ~196°C. CO₂ bursts cell walls. Development time begins.
- Development Phase (8:15–9:30 min): 196–212°C. Acids restructure. Terpenes bloom. Ends at 12–14% weight loss.
Grind Size vs. Extraction Yield: Precision Calibration Table
| Brew Method | Grind Setting (Baratza Encore) | Particle Size (microns) | Target Brew Time | Ideal Extraction Yield |
|---|---|---|---|---|
| AeroPress (Standard) | 9–11 | 400–500 | 1:00–1:30 | 19–21% |
| V60 Pour-Over | 14–16 | 600–700 | 2:30–3:00 | 18.5–20.5% |
| Chemex | 18–20 | 800–900 | 3:30–4:30 | 18–20% |
| French Press | 26–28 | 1000–1200 | 4:00 steep + press | 17.5–19.5% |
| Espresso | 5–7 | 200–300 | 25–30 sec | 19–22% |
Interactive Brewing Ratio Panel: Dialing In Your Ideal Cup
Step 1: Choose Your Strength Profile
- Light & Bright: 1:17 ratio (58g/L) — highlights acidity, tea-like clarity
- Balanced & Complex: 1:15 ratio (66g/L) — ideal default for most origins
- Full & Syrupy: 1:13 ratio (77g/L) — heavy body, reduced acidity, dessert-like
Step 2: Adjust for Grind & Time
If brew finishes too fast → grind finer.
If brew finishes too slow → grind coarser.
Always keep dose and water volume constant when adjusting grind.
Step 3: Taste & Iterate
- Sour? → Under-extracted → Grind finer or increase brew time
- Bitter? → Over-extracted → Grind coarser or reduce brew time
- Flat? → Check water minerals or increase dose slightly
Bean Cellular Chemistry: Chlorogenic Acids, Sugars, and Volatiles
Green coffee contains up to 12% chlorogenic acids (CGAs). During roasting, CGAs break down. Some become quinic acid (bitter), others become caffeic acid (pleasantly tart). Sugars like sucrose caramelize into furans and pyrones — responsible for butterscotch, toffee, maple notes.
Gas chromatography reveals over 800 volatile organic compounds in roasted coffee. Key players:
- Furaneol: Strawberry jam, caramel
- Guaiacol: Smoky, spicy, clove
- 2-Methylpyrazine: Nutty, roasted peanut
- Linalool: Floral, bergamot, lavender
Liberty Beans selects lots based on GC-MS (gas chromatography-mass spectrometry) flavor potential — not just cup score. We track sucrose retention, trigonelline degradation, and lipid oxidation markers to predict roast behavior before the drum even spins.
Direct Trade Logistics: From Farm Gate to Roaster Drum
“Untitled” also describes the unseen journey — the logistics ballet that preserves cellular integrity from harvest to roast. Our Ethiopian Yirgacheffe lot? Picked at 22°Brix, fermented 36 hours in shaded tanks, dried 18 days on raised beds, vacuum-sealed within 72 hours of milling, shipped climate-controlled, roasted within 14 days of arrival.
Every hour matters. Every temperature fluctuation degrades terpenes. That’s why we bypass brokers and contract directly with 12 micro-lots globally — paying 3x Fair Trade minimums to ensure cherry selection, processing control, and rapid transit.
Burr Alignment Checklist: Eliminating Channeling at Home
Channeling — the silent killer of extraction uniformity — occurs when water finds paths of least resistance through uneven grounds. Fix it with this checklist:
- Check Burr Flatness: Use feeler gauge or dollar bill test. Should drag evenly across entire burr surface.
- Calibrate Zero Point: Grind until burrs chirp, then back off 0.5 clicks. Recalibrate monthly.
- Clean Burrs Weekly: Compressed air + brush. Oil buildup causes clumping and static.
- Pre-Wet Filter & Bloom: Pre-wetting rinses paper taste and preheats vessel. Blooming (30 sec, 2x coffee weight water) releases CO₂ so water can penetrate evenly.
- Pour Technique: Center-pour only. Spiral pours agitate fines and create channels.