After the piano board is processed, under the action of ultraviolet radiation, the frequencies of the previously adjusted vibration modes M5 and M2 will increase and gradually become saturated, reaching a certain value and remaining basically unchanged. Therefore, after the board is processed, its frequency is first measured and placed in sunlight until the measured frequency no longer increases. Brushing the primer will also increase the frequency (primer is crucial for the sound quality of the violin), and after drying, measure the frequency; The paint on top of the primer can also increase the frequency. Therefore, these factors must be considered when processing the thickness and distribution of the piano board, so that the frequency of the piano board after the paint dries is the M5 and M2 frequencies you originally set.
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