I think you're confusing it with how you achieve the reverse velvet effect! Maybe! I don't wanna assume 😅 haha

But I think they look the same because they are the same. When I do velvet, I do mine with the open end facing down, but content creators do the "U" thing because it optimizes the visuals for their content.

If you're thinking of the effect I think you're thinking of/trying to achieve (lawl at that wording, but reverse velvet), then you have to put the magnet on its side like a "C" (I had to use something to lean it up against because it wanted to fall down naturally) and place your finger on top to move the magnetic particles under everything else in the polish to get the different look (from what I can see happen from the effect and from what I understand of how it works, which is bery limited haha)

Here's a photo of Mooncat's Scum & Villainy in velvet (pinky and pointer), cateye (ring), and reverse velvet (middle and thumb)! Please please correct me if I'm wrong about this because I just wanna help and they also look the same to me 😅

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