What humans do to get color.
https://www.smithsonianmag.com/smart-news/egg-yolks-gave-tempera-paint-its-enhanced-coverage-and-spreadable-properties-180979192/?utm_source=smithsoniandaily&utm_medium=email&utm_campaign=20211209-daily&spMailingID=46080523&spUserID=OTE5NDcwNzM1NjY3S0&spJobID=2141075795&spReportId=MjE0MTA3NTc5NQS2