Liquid

A liquid suspends pigment or active ingredients in a base of water, oil or silicone, thin enough to pour from a bottle. Heavier particles drift to the bottom between uses, so shake for a full ten seconds before every application or the first pump comes out lighter than the last. Packaging tells you how controlled your dose will be. A pump delivers close to the same amount each time. In contrast, a dropper or an open neck leaves it to guesswork.

Working time governs how a liquid behaves on the face. Long-wear formulas set in roughly 30 to 60 seconds and grip where they land, so apply and blend one section at a time. Hydrating formulas stay movable for several minutes and forgive a slow hand. Either way, two thin layers cover better than one thick one, because each layer keeps its own light film instead of pooling in a crease.

Stability and portability are the trade. Water and oil together feed bacteria, so liquids carry preservatives and a shorter life once opened. Check the open-jar symbol on the carton, where 12M means twelve months from first use. Many liquid foundations also oxidize, meaning they darken slightly as they react with air and skin oil. Judge a shade match 20 minutes after applying rather than at the counter mirror. Airport rules apply too, capped at 3.4 ounces or 100 milliliters per container inside the quart bag.