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During the Zhou Dynasty, Chang Hong, a high official (大夫, dafu) under Duke Liu Wengong, was loyal to the court throughout his life. He was neither servile nor overbearing and possessed a noble spirit of integrity.
Because of his uprightness, he offended powerful figures at court and was unjustly executed by the people of Zhou. Legend has it that when he was killed in Shu (modern-day Sichuan), some admirers collected his blood and hid it in their homes. Three years later, all these dried blood clots transformed into green jade.

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Open the tool →苌弘碧血 (cháng hóng bì xiě) is a Chinese idiom (chengyu) meaning “Blood shed for a just and righteous cause”.
苌弘碧血 is pronounced cháng hóng bì xiě in Mandarin Chinese.
Literally, 苌弘碧血 means “Chang Hong's jade-green blood”. It is used to mean “Blood shed for a just and righteous cause”.
苌弘碧血 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
形容为正义事业而流的血。苌弘:春秋时周大夫,又称苌叔。碧:青绿色的玉石。