Burning vegetable oil to create soot used to make high grade sumi-ink sticks Share this: Share on Reddit (Opens in new window) Reddit Email a link to a friend (Opens in new window) Email Share on WhatsApp (Opens in new window) WhatsApp More Print (Opens in new window) Print Share on TumblrTweetLike Loading... Post a comment or leave a trackback: Trackback URL. Burning vegetable oil to create soot used to make high grade sumi-ink sticks Burning vegetable oil to create soot used to make high grade sumi-ink sticks