I know I have seen something similar once and I have been looking ever since to try to find but with no luck
As far as I remember it, it had a few steps to try… Something like “Run your nails over a shed strand and if it coils up like this and that it’s lacking this and that. Take a shed hair and pull it apart until it breaks and if the break looks like this it’s lacking this and if it’s breaking like that it’s lacking that.”
Following this thread to see if anyone can help!
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