When the wood of a violin expands and there is nowhere to release pressure, it will crack. Therefore, we used water-based gel (also known as bone glue or animal glue) with "low melting point" and "water solubility" properties to bond the violin. When exposed to high temperatures, the water gel will begin to dissolve, causing separation at the junction where the expansion pressure is released. In environments with high humidity, due to the water-soluble nature of the adhesive, it can separate and release pressure when the wood absorbs water and expands.
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