Hi Fernando,
Following on from the PM
If it were mine I would purchase 2 + M of sewer pipe with caps on both ends and suspend the staff inside the pipe with some string and an old T shirt soaked in ammonis at the bottom (not touching the shaft) and close both caps.
Ammonia is very volatile after a few hours there should be nothing left alive.
Lovely historical item from the time of Christopher Columbus, I have some Japanese swords and the condition of such ancient artefacts can be amazing.
Regards,
Ken
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