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The frequencies were determined by a man called Lloyd Mear, and I bought his original manual years ago. Here's where you can get the updated manual and it tells you a bit about how to use them

https://www.balancingbynumbers.com/user-guide-energy-balancing-by-numbers/

I scanned the Hair page

hair-frequencies.jpg

There are a few there that you could test (or just use). Ask again if you need to know more.

This is awesome! Thank you so much :)

Bookmarking that link immediately for further investigation.