1, the oxidation reaction will make the iron on the surface of Muyu stone oxidized into iron oxide, making Muyu stone green. Put Muyu stone into clean water, and add a certain amount of alkaline substances, such as sodium carbonate and sodium bicarbonate, so that the iron oxide on the surface of Muyu stone is dissolved under the influence of alkaline substances, and Muyu stone returns to its original color.
2. Polishing method: Use a polishing machine to remove the iron oxide on the surface of Muyu stone and restore the original color of Muyu stone. Polishing can effectively protect the surface integrity of Muyu stone. Muyu stone is a very rare hollow ore, which is produced in Shantou Mountain, Changqing District, Jinan City, Shandong Province, and has high collection value.