The first gen plasma/titanium coatings are unique but unfortunately are prone to tarnish/yellowing, black stain corrosion, and eventually getting rubbed off into a polished/sheen patches. My previous approach of restoring these frames had addressed the yellowing and about 90% removal of black stains but had limitations with addressing rubbed off polished/sheen effects. So after spending a great deal of time R&D on addressing this issue, the new approach delivers much better results of restoration by addressing all 3 problems. Here's some Ti finish frame half done to clearly show the before/after.