Complexion

Oxidation

A visible color shift, often darker or warmer, that can occur after a complexion product has been on the skin for a while.

Also called: oxidize

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A practical way to understand warm, cool and neutral undertones without turning shade matching into a science project.

Some formulas deepen or shift after application, which is why a perfect fresh swatch can become a mismatch later.

A good shade match should blend naturally into the face and neck after the formula has had time to dry down.

Some foundations deepen or shift after application, which can make a fresh shade match look different once the formula dries and wears.

A foundation can appear darker or warmer after application as it dries down or interacts with skin and other layers.