Wear a cool blue hue indoors and enjoy a bold navy outdoors. Made with solaractive® technology, each shade dramatically changes in direct sunlight and then back again once inside. How to use: like any other polish, color changing nail polish looks best when applied atop an even basecoat. Apply only two thin coats of your desired shade, because two thin coats is always better than one thick coat. Once that has dried, apply a top coat and enjoy a different hue everytime you step into the sunlight.