Society trends / Zhihu Hot List

Why Did Teachers Once Mix a Drop or Two of Black Ink into Red Ink When Marking Work with Fountain Pens?

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为什么以前老师用钢笔批改作业时，不会只用红墨水，而是要在里面滴一两滴黑墨水呢?

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Zhihu Hot ListLast observed #4 · 1.6M heat

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Ranking history & source details

First recorded Oct 27, 2026, 1:37 PM CST · latest Oct 27, 2026, 1:37 PM CST. Ranks reflect attention on each platform.

Retained daily observations
Day	Platform	Best rank	Last rank
2026-10-27	Zhihu Hot List	#4	#4