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Very cool. Rad, scary, but if it holds up that's great.

Please pardon the mispellings and occassional insane word substitution I'm on an iPhone

> On Dec 19, 2015, at 8:54 PM, Tom Fine <[log in to unmask]> wrote:
> 
> Back in early 2014, I sent Charlie Richardson an old Ampex 7.5IPS alignment tape, which is on Ampex 406 tape, circa 1970. The tape was definitely sticky-shed, in fact the first couple of layers I wound out by hand pulled oxide to the adjoining backing layer. Richardson treated the tape with his "Rezorex" process, which apparently uses a chemical peel to remove the back-coat layer, which Richardson contends is the source point of sticky-shed. I transferred the tape in May 2014 with no problems, then put it on a shelf in ambient metro-NYC indoor environment. That first playback was on an Ampex AG-440B. I just rewound and played the tape again, this time on an Ampex 352. Still no sticky-shed evidence, and the audio was fine (test tones were 10dB below reference tone, for the most part, azimuth tones allowed stable adjustment). Richardson had left a little bit of the end of the reel with the back-coat still on, and that tape was solidly sticky-shed. I will keep on playing this tape once a year to see if it goes sticky again.
> 
> I think a more scientific test of this process would require sacrifice of both a sticky-shed test tape and a high-fidelity music recording on sticky-shed tape. Although Richardson wants tapes not to have been previously baked and played, which he contends damages the tape, I'd want a reference transfer after one bake. Then let the back-coat layer be removed, and do a transfer with the exact same equipment and compare both measurements and careful listening, see if the chemical peel does any sonic damage. In the case of my old test tape, all I'm saying is that the tones are at the announced levels, and this tape could be used in a pinch to align a tape deck, although I'd want to bet on a modern MRL tape if it were for anything critical.
> 
> One other thing. The tape with the backcoat removed is not as thin as I thought it would be. It seems to move through the transport just fine. I didn't observe any obvious edge-curl or country-lane motion, and it fast-winds just fine through all the static guides on an older Ampex transport.
> 
> I'd want to do more testing with very familiar high-fidelity music recordings to make sure the process doesn't do any damage to audio, but for at least a year and a half, it does seem to prevent a return of sticky-shed's mechanical symptoms.
> 
> -- Tom Fine