Chapter V · The Brewing · Section 3: In Tang context — reading “已上水老不可食也”

Photo: Wikimedia Commons · CC BY-SA 4.0

Thesis

“已上水老不可食也” only becomes legible inside Tang tribute tea, monastery tea and literati life.

Text

“Beyond this, the water is old and cannot be drunk.”

Context

超过三沸水就"老"了，不宜饮用——这是古人对火候的精准把握。

Evidence

• Collation: 本句紧承三沸，各本一致，无版本差异。
• Existing readings: 吴觉农指出"水老"即水中溶氧散尽、钙镁离子浓缩，茶味发涩——现代科学印证了陆羽"水老不可食"的判断。

Analysis

The largest gap between Tang and now is that tea was simultaneously medicine, tribute and everyday practice. 吴觉农指出"水老"即水中溶氧散尽、钙镁离子浓缩，茶味发涩——现代科学印证了陆羽"水老不可食"的判断。 Without that, the chapter collapses into botany.

Conclusion

The section does not give a universal rule. It demonstrates a method: read the text, the annotation and the Tang context together before making a modern claim.

Source: The Classic of Tea, Chapter V · The Brewing, section 3; the original is in the public domain.

Water and fire magnify the difference. The same leaf at a higher temperature or a longer steep changes the sweet-bitter balance; the text only becomes operational at the brewing stage.

Modern tea science would split the sentence into cultivar, soil, light and plucking variables. 吴觉农指出"水老"即水中溶氧散尽、钙镁离子浓缩，茶味发涩——现代科学印证了陆羽"水老不可食"的判断。 The variables remain useful, but none of them alone explains the cup.

Storage adds another variable: moisture and temperature. 本句紧承三沸，各本一致，无版本差异。 Old and young tea do not share one shelf life, so “the older the better” is not a rule.