Approved for what, exactly
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How color additive approval works
Each additive is listed with the uses it is approved for and the restrictions on those uses. Approval is specific rather than general, which is why the same pigment can be fine in one product and not in another.
The area of the eye is the common restriction
Many additives are approved for external use and excluded from the eye area. An eyeshadow and a soap are different uses, and an additive cleared for one is not automatically cleared for the other.
Mica is the permissive case
It is "safe for use in coloring cosmetics generally, including cosmetics applied to the area of the eye, in amounts consistent with good manufacturing practice". That is about as wide as an approval gets.
Which makes mica a bad mental model for the rest
A supplier whose experience is mica can slip into assuming colorants are generally fine. They are not, and the ones that are not are the ones most likely to cause a problem downstream.
Certification is a separate question
Some additives require batch certification by FDA; mica is exempt because "certification of this color additive is not necessary for the protection of the public health". A certified colour arrives with a lot number that means something specific.
What a supplier should publish
The additive by name, its approval status, the uses it is approved for, and the restrictions. Four facts, once, per product.
And what a supplier should not imply
That a colorant is suitable for lips or eyes because it is pretty and sold to cosmetic makers. That implication is the one that produces a non-compliant product with somebody else's name on it.
Labeling obligations follow the additive
Mica must bear labeling in accordance with 21 CFR 70.25. Colorants come with their own labeling requirements, and passing a product on without them passes the problem on too.