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Old 6th August 2019, 08:25 PM   #15
kai
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Join Date: Apr 2005
Posts: 2,425
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I agree that a few more rounds of etching are likely to reveal some laminations. No twistcore, Id guess though.

While phosphoric acid may be safer for a permanent etch (BTW, what concentration is given on your bottle, Dave?), ferric chloride yields a strong contrast for an exploratory etch of a not fully polished surface ; be careful though since it tends to promote ongoing corrosion: Id just etch a window along the middle of the blade first.

The final approach will depend on the outcome.

Regards,
Kai
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