I recently began a new project: putting together an old violin that had fallen completely apart. The instrument is an older German violin, probably made around 1930 – 1950.
The type of glue used in making violins, called hide glue, is purposefully used because of its unique, not-too-strong properties. During times of extreme humidity or
temperature change, as the wood shifts slightly in size and shape, the glued seams will give way before the wood cracks. This saves the violin from becoming seriously damaged. Hide
glue also ensures that the violin can safely be taken apart and put back together again when necessary. Heat and water will soften the glue, and seams can be safely opened and closed.