Hi Flavio,
Nice patterns emerging!
Ferric Chloride is available here at our Radio Shack stores.
Ferric Chloride is a good agent if carefully applied. I don't know about other countries, but in the USA you need to use bottled or distilled water to dilute Ferric Chloride or your stain may turn brown, like the old Moro kris I posted recently.
If you want to get rid of the black spots, the Evaporust will remove them. This is always a tough decision, becasue the spots are part of the history of your piece.
But you could see the laminations better. Interestingly enough the Evaporrust also shows laminations.
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