Today I'd like to show you a magnetic polish from the Italian brand "Layla Cosmetics". It's called "Turquoise Wave" & is blue-ish green polish with a metallic finish. But fear not, even though it's metallic (& therefore dries a teensy bit brushstroke-y), it looks absolutely gorgeous.
The clue is the magnet that will form a striped pattern. It's integrated in the bottle cap (which I think is a clever solution because this way, you won't loose it).
The polish is on the thick side, so one coat is all you need. After you painted one nail, you'd want to hold the magnet over it immediately, because once the polish's dried, the magic won't work anymore.
You would want to hold the magnet as close to the nail as possible for ~ 5 seconds, then the stripes will show up.
The polish contains iron particles that react to the magnet & form the following pattern: