Has anyone ever definitively learned or deduced what is in a Fernsler? I’ve been using one as a daily touch-up with an old Rodgers the past month or so just to try and figure it out more. My best guess, and it is only me guessing, is diamond In microcrystalline wax. I’ve used a lot of different abrasives and this just always has a diamond feel to me. Anyone really know what’s in the ruby hone?