French,
That's a good tip from Fred. Another thing you can do is use a 'blender' that will blend the color of your own hair with the color of the hair system. We recommend 'Back 2 Natural' which is specially formulated for this purpose. It also contains a conditioner that help your hair look revitalized. You just need to put some of the liquid on a comb and comb it into the area where your own hair meets the hair system. It was developed by Ian Gavet who has years of experience in the hair business. You can get the product on line at http://www.adfhair.com. It's great stuff.
Regards,
John