Chapter IV · The Vessels · Section 8: At a contemporary tea table — reading “第一煮水沸而弃其沫之上有水膜如黑云母饮之则其”

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Thesis

“第一煮水沸而弃其沫之上有水膜如黑云母饮之则其” still has operational value at a contemporary tea table, provided Tang conditions are not silently universalised.

Text

“When the water first boils, skim off the film that rises on the surface, like black mica; drinking it spoils the flavor.”

Context

水膜：头沸水面的浮膜。黑云母：黑色云母片。味不正：味道不正。

Evidence

• Collation: 各本一致。吴觉农注：此"水膜"为水垢与杂质浮沫，撇之使茶汤洁净。
• Existing readings: 吴觉农指出"弃其水膜"是唐代"洁水"的关键一步：水沸后矿物质与杂质浮于表层，撇去则味正——现代煮水同样讲究"刮沫"，此传统千年未变。

Analysis

To repeat this section today is not to copy a Tang utensil list. It is to keep its order of judgment: leaf first, then water and fire, then the table.

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 IV · The Vessels, section 8; 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.

In Tang context, 吴觉农指出"弃其水膜"是唐代"洁水"的关键一步：水沸后矿物质与杂质浮于表层，撇去则味正——现代煮水同样讲究"刮沫"，此传统千年未变。. Tea was tribute, medicine and monastery drink at once, not a standalone commodity; the conclusion cannot be transferred without that context.

Modern tea science would split the sentence into cultivar, soil, light and plucking variables. 吴觉农指出"弃其水膜"是唐代"洁水"的关键一步：水沸后矿物质与杂质浮于表层，撇去则味正——现代煮水同样讲究"刮沫"，此传统千年未变。 The variables remain useful, but none of them alone explains the cup.