丹 means “red, cinnabar, sincere”

たん · tan

Also: rust-colored, red lead, pills

Kun'yomi (Japanese reading)
に
On'yomi (Chinese reading)
タン

JLPT N1 · Taught in secondary school · 4 strokes

The story

A frame with one dot inside: the Shuowen reads it as a mine shaft with a lump of red cinnabar in it. 丹 is that red, on the head of the 丹頂 crane, and also wholehearted care: farm labels boast of crops grown 丹精込めて.

Used in 丹念 (tannen, painstaking care), 丹精 (tansei, devoted effort), and 丹頂 (tanchou, red-crowned crane)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.