When the face or figure has been finished, the ground must be cleared for polishing. Great care must be taken during the work not to cut down into the natural ground, marks being very difficult to efface. Use the Round Scawper to remove the white, and then the Flat tool to remove all traces of the white. Next cut up a bit of firewood into small lengths, point each length, and rub the surface of the Cameo with powdered pumice-stone and water, then wash with warm water and soap, with the aid of a nail-brush. With a fresh piece of wood, rub the ground with pumice-powder and oil until the surface is perfectly smooth and without a trace of cut or mark of any kind; wash once more, then apply the final polish. Take a fresh bit of wood, and mix on a plate as much dust of Rotten-Stone as will lie on a shilling, with a few drops of Sulphuric Acid, forming a yellow paste. Rub a small portion of the ground at a time, and remove the paste while still wet; if the paste is allowed to dry, it destroys the texture of the ground. After the ground has been gone over, rinse the Cameo in cold water. To remove the shell from the Stick, cut away the cement from the edge, then hold the Stick upright against the edge of a table, and give it a smart rap with a small hammer; the Cameo will slip off the top unhurt.