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He has pinpointed markers signaling the presence of an unwanted, purplish color in wheatgrasses caused by the pigment anthocyanin .
The combination of excess sugar sap and sunny days create an abundance of the pigment anthocyanin and the brilliant fall colors of crimson and purple.
Beech trees have more of a red pigment called anthocyanin and birch trees have more carotene which turns leaves yellow.
the earliest carrots were purple, because they contained anthocyanin
As well as a high content of carotene, the same substance that gives carrots and egg yolks their distinctive colour, these oranges develop a red pigment, anthocyanin , which gives their flesh its hue.
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