Meaning of undetectable coverage?
Hi, I’m reading a description of Bobby Brown foundation and it says “this water-based, oil-free formula delivers undetectable coverage.” What does “undetectable coverage” mean?

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Answer

It means the formula (lotion ?) is undetectable when you apply it. That is, you apply the formula/lotion and where you've put it on there is no trace of it. No oily residue perhaps.

Often this term is used for sunscreen lotions - undetectable coverage. ie. You apply it on your body and there's no visual or other sign that it's there.