The long protein chains of hide glue, the polysaccharides secreted ... A safer alternative is plain old white glue or wood glue, which is poly-vinyl acetate (PVA) adhesive. PVA is a non-reactive ...

If the bond becomes too weak, you'll need to pull the pieces of wood apart, remove the old glue, then re-glue the joint. If this is not done carefully, it can cause permanent damage to the wood.