Beauty Super Slim Grey vs Black Duo: Precision Liner Showdown Now
The Super Slim in Grey and the Black 400 duo pack offer the soft single versus classic value choice in precision liner. We compared them on shade role, versatility, value, and who each suits.
| Factor | L’Oréal Infallible Super Slim Liquid Eye | L’Oréal Infallible Super Slim Liquid Eye | |
|---|---|---|---|
| Shade | Grey, soft precision | Black 400, classic intense | Soft vs classic |
| Line character | Soft defined, natural | Crisp defined, bold | Different intensities |
| Forgiveness | Very forgiving | Shows every wobble | Grey easier |
| Versatility | Daytime, natural looks | Day to evening, wings | Black more versatile |
| Pack format | Single pen | Pack of 2 | Duo better value |
| Cost per pen | Standard single | Lower per pen | Duo cheaper |
| Best for | Fair coloring, offices | Classic lovers, wings | Different users |
| Beginner friendly | Most forgiving | Standard learning curve | Grey easier |
| Typical price | Check price | Check price | Duo slight premium |
| Best overall | Best soft precision | Best classic value | Different crowns |
Our Verdict
Buy the Super Slim in Grey if you want the softest most forgiving precision liner for daytime natural definition, especially with fair coloring or in professional settings. Buy the Black 400 duo if you want the classic crisp black liner wardrobe with backup security at excellent per pen value. Precision liner devotees eventually own both, reaching for grey on natural days and black when definition must be definitive.
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Tightlining With a Super Slim Liquid: The Exact Placement
The L'Oreal Infallible Super Slim's fine felt tip is a natural tightlining tool, because the slim point reaches between lash roots with more precision than any pencil. The product belongs on the upper lash line's inner rim, the narrow strip between the lash roots that you expose by tilting your chin up and looking down into a mirror. Dot the felt tip between the lashes rather than drawing a stroke; the liquid fills the gaps and the lash base darkens, which reads as thicker lashes with no visible liner at all.
Liquid tightlining has two rules that differ from pencil. First, let each section dry for a few seconds before blinking fully, because wet liquid on the inner rim transfers to the lower waterline on the blink. Second, use the side of the felt tip, not the very point, for tightlining; the point deposits too much product in one spot and the side gives an even fill. The Black 400 shade gives the most dramatic lash-thickening effect, while the Grey shade tightlines more softly for daytime. Common mistake: tightlining after mascara, which wets the mascara and drags black down the lashes. Tightline first, mascara second, every time. Once the technique feels natural, it takes under a minute and replaces the need for a visible liner line on no-makeup days.
Wing Angles for Deep-Set vs Prominent Eyes
Every wing tutorial draws the same flick, but the correct wing angle depends entirely on how deep-set or prominent your eyes are, and the Super Slim's fine tip is precise enough to execute either. For deep-set eyes, the lid space is limited and a thick wing disappears into the socket. Keep the wing thin and extend it outward more than upward, following the lower lash line's angle as your guide. A shorter, straighter flick stays visible on deep-set eyes where an ambitious upward wing folds into the crease and vanishes.
For prominent or protruding eyes, the opposite applies: a wing that extends too far outward exaggerates the projection. Keep the flick shorter and angle it slightly more upward, and keep the line itself thin along the lid so it does not add visual weight. The Grey shade is the smarter wing color for prominent eyes in daytime, since black wings emphasize lid projection. Hooded eyes, which often accompany deep-set placement, need the wing drawn with the eye open and looking straight ahead; drawing it on a closed lid guarantees a kink when the eye opens. For a full wing-technique walkthrough with a pen designed for the job, our Charlotte Tilbury Feline Flick guide is the dedicated resource, and beginner-friendly liquid application basics are in our Clinique Pretty Easy liquid liner guide.
Grey vs Black: Choosing Your Daytime Liner Shade
The Grey versus Black 400 choice in this comparison is really a question about how much contrast your face wants. Black liquid liner is the highest-contrast eye product most people own, and on fair skin or with soft features it can read as harsh in daylight, especially in a sharp wing. Grey gives you the definition of liner at roughly two-thirds the intensity: the lash line still reads as defined, but the edge softens and the overall effect is closer to a natural shadow.
As a rule, grey flatters daytime, office, and minimal-makeup looks, while black owns evening, photography, and occasions where the eye needs to carry the face. Grey is also the more forgiving shade for beginners, because a wobbly grey line is less noticeable than a wobbly black one while you are learning wing symmetry. If you wear glasses, grey liner avoids competing with dark frames, which black liner tends to do. The Black 400 duo pack makes sense once you know black is your shade, since the per-unit cost drops; until then, the single Grey is the lower-risk experiment. For waterproof liquid options that hold either shade through long days, see our waterproof eye pencil guide.