information about this prabot, please

[sjors]

Having spots all over your blade, did you use chemical liquid to work (clean) on it? What kind of chemicals, please?

Dear Ganjawulung,
In real there are no spots like that on the picture, I think it's some kind of reflextion of the oil I used.
I didn't use any chemical liquid, just vinegar after derusting it for some time in a electrolithic way because of the heavy rust ( it doesn't "eat" material, just rust), the same way I do with Archeological findings (another hobby of mine).
I included a "before and after"picture.