This color changing nail polish of Sweet City is bi-colored， which can change from sky blue to mauve according to the temperature of your body as well as the environment. As our little jewel， it's sumptuous with its nebulous and mysterious blue violet. Ingredients certified by DURLIN. NOTE， the color change appears above 20 degrees. It contains no formaldehyde， toluene， or phthalates， which makes you beautiful and at the same time keeps you healthy. Hypoallergenic and available for free delivery， it goes green and fast.