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There are three main chemicals in color feeding red factor color. Canthaxanthin (Roxanthin Red), Beta-Carotene and Orange Carotenoids.
The only known animal requirement for cobalt that I can grab on to is a constituent of Vit B12. The presence of Cobalt provides some insurance in case a diet is lacking sufficient Vit B12. I do not see where Cobalt is a source of pigmentation but more of a trace mineral for animals that have an all-plant diets containing little or no Vit B12.
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