Folks,

I have a book from Sugimori on Japanese Patinas. It includes two iron black ones, which, according to the photos, make for a nice sooty black appearance. I did not want to try the first one, since it includes arsenic. However, an application with the second one, 'Sabi-tsuke 2' did not produce anything worthwhile. It includes sulfur, copper sulfate, table salt and lots of vinegar and it is to be applied in several coats.

Does anyone have tried it with good results? Any suggestions? The recipe does not propose heating of the substrate. May be that could make a difference?