This is BLUESKY’s fingertip magic trick with a simple change in temperature. Show off two colors in one – one light, one dark. Darker colors will b e highlighted by the cold whereas warmer temperatures will bring out the lighter hues. You can switch between multiple shades throughout the day ,without repainting your nails or changing anything at all. One for warm and one for cool. The nails are one color at room temperature, but the pigments will change color once they are put into slightly warmer water.