The Citane Process Compass

Leaf maturity at harvest is the single most consequential decision in the entire process. It determines which volatile compounds are available, which enzymes are active, and which processing pathways are possible downstream.

• Pick individual leaves or small clusters — avoid stripping branches which bruises retained leaves
• Count from branch tip: 1st–3rd leaf = young flush (highest volatile potential); 5th–7th = mature
• Handle cut surface upward where possible — exposed cell wall begins oxidising immediately
• Do not stack harvested leaves in deep piles in the field — compression bruising initiates enzyme cascade
• KoffyKraft observation: leaves from rubber-shaded Chandragiri Arabica at 130m show slower enzyme activation post-harvest than open-canopy leaves — likely due to lower ambient leaf temperature

The transfer window — time between harvest and first processing step — is an active period. Enzymes begin working the moment the leaf is cut. Managing this window determines whether you arrive at the next stage with the chemistry you intended.

• Breathable containers (bamboo baskets, open crates) — prevents CO₂ and heat build-up from enzymatic activity
• Avoid sealed plastic bags for holding >30 min — anaerobic atmosphere initiates unwanted fermentation
• Single layer preferred for young flush — stacking causes compression bruising and uneven enzyme activation
• For longer holding (oolong / black target): loose layer in shallow trays at ambient temperature is acceptable
• Traditional Engere practice: leaves pounded then immediately decocted — zero transfer window (Yohannis et al. 2026)

Whether to wash — and how — is a genuine decision with compound-level consequences. Water contact initiates cell surface reactions. The correct protocol depends on what comes next.

Withering is the first intentional transformation stage. It controls the extent of enzymatic oxidation before any heat treatment. Duration and temperature together determine which volatile families develop. This is where process style is committed.

• Indoor shade wither: most controllable — consistent temp, no direct UV, manageable humidity
• Sun wither: accelerates carotenoid conversion (→ β-ionone). Higher sweet potential but harder to control. Stop before leaves become crisp.
• Shade wither at Thumpassery: rubber canopy provides natural diffused light. Ambient 22–28°C. Slower but consistent.
• Avoid wither in sealed or low-ventilation spaces — CO₂ from leaf respiration can trigger unintended anaerobic conditions
• Target moisture loss: approximately 20–30% of fresh weight. Leaves should be pliable but not brittle.

Mechanical manipulation controls cell wall rupture — the release of intracellular compounds into contact with oxygen and each other. Too little and the substrate is not primed; too much and the oxidative cascade runs ahead of the intended profile.

Wringing generates a small but measurable temperature increase in the leaf mass from mechanical energy. This post-wring temperature rise accelerates enzyme activity — intentionally or not.

• Observe post-wring leaf temperature before committing to hold time. A 2–3°C rise is normal.
• If post-wring temp exceeds 28°C in ambient conditions: shorten hold or move to cooler space to slow cascade.
• Wring hold (leaves held in wrung position): 15–30 min allows oxidative reaction to develop from rupture points while limiting how far it progresses.
• Releasing and spreading after hold: resumes normal surface oxidation at slower rate. Use to fine-tune before next step.
• The wring-to-hold-to-release sequence mirrors oolong tea processing principles. ● Chen & Kitts 2018

After manipulation, the leaf is in an active reactive state. The question is not whether reactions are happening — they always are — but whether to let them run, stall them at a chosen point, or stop them entirely.

Moisture reduction arrests remaining enzyme activity through heat or desiccation, and stabilises the leaf for storage and brewing. The method affects volatile retention — high heat drives off aromatic compounds faster than low heat.

• Target moisture content for storage: 5–8% (crisp, not powder). Leaves should snap cleanly, not bend.
• Over-drying (>4h at 70°C): volatile compounds continue to evaporate. Aromatic intensity decreases.
• Under-drying: residual moisture enables mould growth in storage within days.
• No formal moisture measurement equipment required at small scale — snap test and visual assessment sufficient for field use.

Optional measurement points that help track process consistency across batches. None are mandatory at small scale — sensory assessment is the primary tool. Introduce instruments only where they add information that sensory cannot provide.