If wool is painted with external materials alone, it is not stable, but if you are painted with iron teeth or white or chromium tooth, the optical stability and washing of the color of the pigment is increased. Of the colors of wool with mazoji materials, the results can be reached. A – With the iron tooth, the grays were made clear to black. (b) With the chromium tooth, the chromium has obtained a clear brown and flakes. P – With the white cup of brown yellow eggs made very clear.