any type of polish/creme/whatever you put on a lighter color leather in which the leather is absorbing the content will be ever so slightly darkened. this will fade back to normal over a short period of time. the product in which the least darkening as taken place, in my experience, is neutral cordovan creme. reno is a cleaner just as much as its a conditioner despite what anyone wants to tell you otherwise. saphir creme is purely a conditioner.