加工・条件 / process-brewing-time
infusion time
Duration of extraction when brewing tea
主張（1）
infusion time can_increase astringency予備的
範囲: Tea infusion in an artificial oil-body study
注記: Human sensory confirmation and brewing-condition detail are required.
Longer brewing increased catechin content and the model's inferred astringency, with gallated catechins increasing disproportionately.
限界: In-vitro model rather than direct human intensity measurement.