The shiny side of a CD-R. It's kind of scuffed up, but that's not visible in the photo or very important. The wild part is that there's a bunch of tiny black spots under the polycarbonate layer where the data has been completely destroyed. This CD ripped without issue.
https://social.isopod.cool/media/1e8f4d2938321d751ed8ef1f318704643464258bd8b226ed2b0971419d714172.png