bilin

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Why Do Leaves Change Colors in the Fall?

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Why Do Gray Hairs Have a Different Texture?

Slices of ripe apples on a wooden table

Why Do Sliced Apples Turn Brown?

Back of a head of an older man with gray hair (aging, elderly, mature, grey, seniors).

Why Does Hair Turn Gray?

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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)

11 Banned Books Through Time

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

Rural Irish landscape, Sligo, Ireland.

Why Is Ireland Two Countries?

Thanksgiving Celebration Traditional Dinner Setting Food Concept

Why Is Thanksgiving in the U.S. Celebrated on a Thursday?

Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway

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Thanksgiving Turkey with all the sides

Why Do We Eat Turkey on Thanksgiving?

bilin: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	linear tetrapyrrole • bilichrome

Topics

phycoerythrin phytochrome phycocyanin biochrome chromatophore melanin porphyrin carotenoid visual pigment flavonoid ommochrome sclerotin flavin