Citranaxanthin

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What Wikipedia says

Citranaxanthin is a carotenoid pigment used as a food additive under the E number E161i as a food coloring. There are natural sources of citranaxanthin, but it is generally prepared synthetically. It is used as an animal feed additive to impart a yellow color to chicken fat and egg yolks.

Excerpt from the Wikipedia article “Citranaxanthin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jynto (talk), CC0, via Wikimedia Commons.