This isnt really so much a problem as it is an annoyance. I have the kuhmo ecsta supra 712's. I've had them for a few months now (a little under a year) and the tires dont look as "black" as normal tires. After i clean my car i put the tire shine on my car and the tires aren't very reflective. They still look wet, but not as much as they should and it quickly wears off. They have more of a brownish tint when normal than a black. They aren't dry rotted or anything or reallky look like older tires, but they dont accept the tire shine that well and have a brownish tint. DId this happen to anyone else? Is there anything i can do to the tires to treat them?