Two sikin panjang enter my collection

[Marc M.]

Out of my comfort zone, a sikin panjang, Sumatra. I have a weakness for simple straightforward choppers. Oal 72.5 cm, laminated blade, horn handle with a large dry crack. Should I do anything to keep the crack from getting bigger?
From the seller's photos, I suspect it was a laminated blade. Upon receiving the blade cleaned up and tried to etch it. The etching product I had left was old and did nothing. Tried with household remedies, vinegar and lemon juice. Vinegar did little or nothing, lemon juice more. Two days of regular rubbing with lemon and a soft etched result.

Regards
Marc