Hey, we got some foils many years back as a bit of a tester, I have no idea where they came from. I know it must have been around 1989. After carefully cutting them to the required shape we used them on a variety of CD's and the results for us four were conclusive. Christ, one of the CD's was a Status Quo album...!
Having moved on since those days and having said 'Cheers' to those friends I no longer use anything by PWB. I still find his 'preachings' very interesting though. I never forgot those findings.