To find out a car's color using a VIN number, you would need to:
1. Use a VIN decoder website: There are many websites that allow you to input a VIN and retrieve information about the vehicle, including its color.
2. Contact the vehicle manufacturer: You can contact the manufacturer directly, providing them with the VIN number, and they can likely provide you with the color information.
3. Check the car's registration documents: The vehicle's registration papers may include the color information.
4. Check the car's title: The title of the car should also contain the color information.
Remember, the accuracy of the information you receive from these sources may vary.