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This manicure is very easy and fast. you can also customize it to different occasions and change the colors all the time.
So all you need are two different colors of nail polish of your choice.
You start of with painting your nails in the color you want the line to be in. So in this case Zoya`s Indigo was used.
Next you paint a layer of the second color over your first color. You have to leave a spaced outline all the way around your cuticules and sides of your nails. Here they used Zoya`s Blu.
Then use a topcoat and your nails are done.
*pics from link below.*