Btw... I was told by Tsaruta, the main guy at Aoi art in Japan , that he preferred a thin layer of light sewing machine or gun oil over choji oil for preservation. I asked him about history , etc, and he replied that some more modern inventions were better. He said to make sure it was clear, not a dark hue as it could shade the steel over time. He suggested choji contained "organic" content that dried faster and can gum up over time. That's what I gathered from his limited English response.