Resetting styles in objects

 From:  mickelsen
If you have a style set in an object, how do you reset it back to the default style? I have accidently made several objects in my current drawing bright red and I can't figure out how to make them go back to the default black. I was just trying to make a construction line red so it would be easier see amid all the clutter. So I guess I would also like to know how to set the styles correctly as well as reset them.