The scratches on the blue scarlet tempered film were repairable at that time. The blue scarlet tempered film is a layer of tempered glass, and its Mohs hardness will not exceed 7, that is, about 5-6, which is higher than metal and lower than aging. In other words, keys and knives will definitely not scratch the glass film, which has nothing to do with the surface coating, but will still be worn by time (that is, dust and fine particles in daily life), so it can be repaired at that time.