Archeology
Raw materials for blue ink production of ancient Egypt
Historically, archaeologists believe that the ancient Egyptians used black ink, which was purely carbon-based until the 4th and 5th centuries.
Blue Ink
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Articles about Blue Ink
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Scientific application
Why does the word written in blue ink turn black?
If you use a blue and black ink to write a diary, you will find that the text written today is blue, and the text written yesterday was black. That phenomenon is the res…