The other points are that: - color preference varies by country - in mass production, the yolk color can be tweaked by the producer with food additives (e.g.

The other points are that: - color preference varies by country - in mass production, the yolk color can be tweaked by the producer with food additives (e.g. https://www.dsm.com/anh/en_NA/products/carotenoids/carophyll/eggs.html https://www.dsm.com/anh/en_NA/products/carotenoids/carophyll...)