About Grip Color

The color of a grip specifies whether the grip modifies a selected object or other objects in a drawing. Typically, a grip is used to change a property of a selected object. However, some grips might change the properties of all other objects in a drawing with the same style as the selected object. Other grips do not change the selected object at all, but are used to change the grip-editing mode of the object.

Grip Type and Default Color Function
Object (Cyan) changes a property of a selected object
Style (Magenta) changes a property of a selected object and all other objects with the same style in the current drawing
Auxiliary (Gray) does not change any property of any object

You can change the color of these grips on the AEC Editor tab in the Options dialog box which is accessed from the application menu.