I actually have known that for the past 20 plus years. Way back, I scoured the depths of titanium and titanium nitride, researched and also called factories that produce titanium nitride coatings on surfaces of various objects to protect them. When I was collecting F1 memorabilia I used to also find out everything and every detail about how and what they were made of, always loved that. I have an obscene amount of printed material I collected on all F1 objects. I clarified the fact that they are made with a titanium nitride coating in my old eBay listing a few years ago. I had done that because some people still believed they are gold plated and I wanted to get that straight for people viewing my listing. It's been a great while since I have thought about any of this and unlike titanium and titanium nitride coatings, I lack the inertness to avoid becoming rusty. Thank you for correcting my misspoken use of terminology here on the forum and preventing folks from becoming mislead.