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Re: [AV Media Matters] High-resolution videotape
Before we used ferro-fluid, we used ultra-fine carbonyl particles in
a highly volatile solution like heptane. This worked great for
audio but not so well with the small tracks on a videotape. Around
1971, I discovered ferro-fluid and tried in on videotape. It took a
lot of experimenting but I eventually was able to get some fantastic
photographs of the magnetic recordings on the videotape. At $300
per ounce, I didn't want to waste it. The last time I bought some
(around ten years ago), it cost $500 per ounce.
I use EMG 408 but EMG 508 also works. One is oil-based and the
other is water-based, and I don't remember which is which.
The website is: www.ferrofluidics.com
It was developed for special applications and magnetic tape
development is probably a tiny fraction of their sales.