Sumi™ inks are available as well to tattoo artists. These inks will have a very smooth grey appearance in the skin and are mixed in similar ways mentioned in the grey wash technique. There are some manufactures that are selling Sumi™ inks for tattoo purposes, but they can also be purchased at art supply in solid bar form. The bars must be ground and mixed with an agent prior to tattooing. Any time there is a material that is not intended for tattooing and the source is not designed for the use in the skin, it is important to autoclave the liquid.