Im getting a green tint on my fountain, is this harmful?
The green and blue-green tint forming on your fountain is actually a natural patina as the copper reacts to the water over time. This is not a rust and it will not hurt your fountain at all. This only adds to the natural beauty of the copper and adds character to your fountain (example: The Statue of Liberty). If your fountain is placed outdoors in the weather, this patina will form more rapidly and cover the entire surface of your fountain.