In the previous study on wearing of glass, the author arrived at a conclusion that the polishing is in the main the “molecular wearing”, the rubbing-off of particles of constituting mass in the form of molecules, atoms or ions. If this is the case, such torn-off particles from the rubbed and rubbing substances of stable structure and the vacant sites formerly occupied by these particles would both be in unstable and nascent state and react chemically with surrounding matter that comes into contact. Experiments are carried out and chemical changes observed on various kinds of metal when rubbed with sulphur are compiled in a table. It should be noted that Pt and Au combine directly with S by polishing while no usual method can produce such chemical combinations.