Mar 01, 23 10:15 PM
QUESTION: I recently purchased my first functional katanas from musashiswords and immediately cleaned and oiled them. Two days after, I unsheathed them again to take in their beauty, but much to my astonishment there were strange marks (more like the rainbow designs seen when oil is on a wet road, just as wavy, but not the rainbow colour) on some areas of the katana. What does this mean? Did I improperly oil the katanas? Is this the start of rust?
If it helps solve this mystery, here is how I oiled my swords:
-first used lint free cotton pads to wipe off the original thick gunky oil
-then used rubbing alcohol and lint free cotton pad as a solvent to remove any missed remaining oil
-then used rice paper and light mineral oil to apply a thin layer on the entire katana blade surface
After seeing this, I was planning on cleaning and oiling them again. But since I had only oiled them 2 days ago.. so I was a bit skeptical in suspecting rust. So I touched it (i know you're not supposed to, but I was planning to completely clean and oil it again after) and it was still oily on the wavy rainbow like marks. So I re-cleaned and oiled that katana. My second katana had the same marks, this time I did not re-clean and oil, but just used some rice paper and a drop of light mineral oil over the area and the strange wavy rainbow like design dissappeared. It was only 2 days since oiling but could those marks have just been from the oil drying? or the start of rust?
It's not rust, but the rainbow effect you are seeing is probably some of the residual rubbing alchohol.
My advice is to wipe to sword clean with a new cloth, spray with some WD-40, wipe again and then reoil. I am pretty sure that should take care of the problem.
Hope this helps.
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