Setting a colorTransform for a clip affects whole movie

I can’t seem to get my head round why when I set the colortransform object for one clip in my movie, it seems to affect the entire movie - textboxes and everything…

I thought that a colorTransform it only affected the specified and child clips in the movie.

Example - I have a lot of things attached to _root.

I have a particular clip which is on its own and is attached to the _root - this is my code…

 
clip.transform.colorTransform = new flash.geom.ColorTransform(0.05, 0.05, 0.05, 1, 0, 0, 0, 0);

That seems to set the clip nice and dark as I want it to - but it also sets all other clips and all clips dynamically added afterwards to have the same colortransform settings… am I missing something from the CT object?