For the soap carving section of the Canadian DAT, we can use either a pencil or a sharpie. Sharpie is not as accurate as pencil mark b/c the lines drawn are thick. However, if I use pencils, a mark is formed, resulting in an unsmooth piece of soap. Is it not possible to draw on the soap with a pencil without leaving an unremovable mark on it (which they will take off marks)?