'Back2 Natural' is a great product and Toplace has always recommended it. It was developed by Ian Gavet who has spent his entire life in hair care. He's worked for several big hair companies including Clairol. He travels the world putting on seminars on hair coloring and hair care. He developed 'Back2Natural' specifically for coloring hair systems. Nobody knows more about hair coloring than Ian. You can put it on your comb and 'blend' the color of your hair system with the color of your own hair. Or you can put it on your whole system and it will recondition it. You can order the product from his webiste: http://www.adfhair.com.