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A lip liner is harder and drier than a lipstick: more wax, more filler, less oil. Two consequences follow.

1. It forms a physical dam at the vermilion border. The commonest lipstick failure is feathering — colour wicking outward along the fine radial lines around the mouth, carried by sebum and the oils in the lipstick itself. A waxy liner blocks that path.
2. Filled across the whole lip, it grips. Lipstick applied over a full base of liner has something dry and textured to hold onto, so when the lipstick wears off from the centre there is still colour underneath rather than a bare patch with a ring.

Filling the whole lip, not just outlining, is the single technique that changes results here.

• Matched to the lipstick for the cleanest look.
• Matched to the natural lip for a versatile liner that works under anything and never leaves a visible ring as the lipstick fades.
• Deliberately darker than the lipstick for a defined, contoured effect — a 1990s convention that returns periodically and is a stylistic choice rather than an error.
• Clear / invisible liner — wax only, no pigment, purely as an anti-feathering dam. Useful under bright colours and gloss.

Drawing outside the natural border to suggest a fuller lip works within limits, and the limits are optical rather than moral. Small extensions blend; large ones read as a drawn line sitting on skin, because the vermilion has a different colour and texture from the skin around it and pigment on skin does not match pigment on vermilion.

The reliable version: extend slightly at the centre of the upper and lower lip only, blend the edge inward, and add gloss at the centre. Extending along the whole border, particularly at the corners, is what looks obviously drawn.

Cosmetic in the US — FDA primary category (08), makeup preparations (not eye) — and governed by the strictest colour additive requirements in cosmetics, because a lip product is partly ingested:

• Colour additives must be approved specifically for use in cosmetic lip products, and certified colours must come from FDA-certified batches. Chromium oxide greens and ultramarines are approved for eye-area and external use but not for lips.
• Carmine (CI 75470) must be declared by name in the US.
• FDA's December 2022 final guidance recommends a maximum of 10 ppm lead in cosmetic lip products.

A liner marketed for use on both lips and eyes has to satisfy both lists at once, which is a narrower palette than either alone — worth knowing before using a lip liner as an eyeliner or the reverse.

Two years or more after opening for a sharpened wooden pencil, which is the longest life of any lip product for a specific reason: sharpening removes the contaminated outer surface before every use. That is a hygiene function, not just a point.

Twist-up liners cannot be sharpened; wipe the tip with alcohol and replace them sooner. Rancidity of the oils eventually ends any pencil — a crayon-like or putty smell.

Do not share a lip liner, and discard one used during a cold sore outbreak.

• Makeup — the shelf this sits on, and the rest of it.
• Cosmetics — what the label is legally allowed to say, and the full catalogue.
• The rest of Lips — Lipstick · Liquid Lipstick · Lip Gloss · Lip Stain · Lip Oil · Lip Plumper.
• Regulatory statements here follow the FDA and EU sources listed on Cosmetics, read 16 August 2026.