Restoring and sharpening a quality 12inch (30cm) Nicholson hand smooth file.
I tried chemical sharpening with ferric chloride and It definitely made it feel sharper. The line near te tang after the ferric chloride soak is a thickness difference between the etched part and the original surface.
Products used:
0:59 WD-40
1:34 Degreaser
1:51 Sodium carbonate
2:07 12V power supply
2:55 Ferric chloride
3:26 Sodium bicarbonate (and water)
3:56 WD-40
4:03 White mineral oil
Interesting video about Nicholson made by a fellow maker:
https://youtu.be/MmGPRQsPL3U
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