It is dark ash metallic. It does sometimes have a purple/blue hue depending on lighting but it does look black at night. It is a really nice color and IMO the metallic helps hide some dirt and microscratches compared to the standard black.
Does your RST have air suspension?
What did you use to lower the vehicle?
Any tire rub with the wheel/tire combo you have?
I put factory size tires on my factory wheels and I have a little tire rub if I turn the wheel hard one way or another and I typically only do that if I'm in a tight spot and usually I'm going very slow (on the brakes, most of the time). I posted on here and people said that the tires I bought just have a bit more rubber than the factory brand. Anyway, I was just curious about your setup since you have wider wheels, but the offset also plays a factor into that, as well.