Posted By:
RonMatt
The difference between enhanced and added to is a matter of intent. For example, I had a T201 Mecca Double Folder card of Tris Speaker that has mainly soft pastel colors that are part of the card. Someone over the course of time managed to dot one of the corners with what looked like a black felt tip pen. This is something that would be considered "Added to". Conversely, I've had some 1971 Topps cards which have a solid black border where people have added black marker to areas of weakness thus enhancing the card.
Hope that helps.
Ron