This nail-art technique gives a 3D illusion to the nail. Nail tech Maja Vasiljevic uses neon colors to do it. She first covers about half of the nail in a base coat that is shaped into a point. She then uses the first neon color to trace around the point. Next, she traces the first color with the same color in a transparent formula. After that, she traces the second color in a glitter formula. That gives her three layers of color, and the 3D look is complete. You can see more at https://www.instagram.com/m.vaasiljevic/?hl=en.
