How to make duplicated object be colored independently? I have a blender object. I applied a diffuse color to the object. Then I duplicated it. Now I want to apply a different color to the duplicated object, however, the original object also changed to the new color. 

How can I make the two objects have different colors?
You will need to add a new material (you duplicated the object but you didn't make a different material). 

Click the number next to the material name to make a single user copy.