Mix henna / mehendi powder in water and 2-4 drops of fresh lemon juice to make out paste. Now fill the paste in a plastic cone. May use it after 15-20 minutes to draw designs on you palm and foot. When it is dry, you may apply eucalyptus oil or coconut oil. Wait for few hours say 8 hours to get it dried and then wash your hands. Use soap while washing hand to get a lighter color.