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Turn the question into a controlled engineering duty
Set mineral, alkalinity, metals, chlorine, oxygen and microbiology limits from extraction, color, flavor and stability objectives. The acceptance basis must resolve source and treatment variation together with tea and color sensitivity, then assign operating limits, responsible roles and controlled records for this exact task. Define tea grade and lot variability, extraction and sensory targets, formula, solids and acidity, oxygen and light sensitivity, preservation route, package, production campaign and shelf-life methods. Name the extraction yield convention, actual time-temperature reference, fines and clarity boundary, maximum extract and treated-product hold, approved sensory preparation, color method and light-exposure case so raw-material and process drift can be distinguished. Record every input with units, source, approval status, credible range and decision owner. Keep an unknown visible when it can change sizing, hygiene, packaging, automation, utilities, cost or schedule.