Black chrome has always been the one that looked dirty to me, not to mention it almost has a purplish hue to it. Hyperblacks can look dirty too, but mostly when they actually are dirty. Anytime I see black chrome wheels, I have to look at them for a second to see if they are infact black chrome, or just dirty normal chrome.
Thank you, yes they are hyperblack. I don't own the car anymore, but back when I did I ran a few different set of rims over time, and the hyperblacks were easily my favorite ones. I did want to get a set of chrome saleens, but was planning on keeping the hyperblacks too.
As for the term hypersilver, I'm willing to bet it's just the seller using that name instead because the wheels are more silver than anything. They are almost silver with a black metallic reflection to them.