The repair of cracks
Repairing cracks is routine work carried out each week in a violin-making laboratory. However, it requires great practice. A crack should be reopened, if it has already been glued back together, and cleaned by creating a chemical reaction between hydrogen peroxide and chlorine. Perfect alignment of the pads is essential to obtain the best results. The fracture is glued with animal glue, taking care to stabilize it with needle clamps. The cracks should be then reinforced with thin cleats in spruce for the front or in maple for the back and the ribs. These are fitted at intervals across the cracks.
M. Menanteau, Rome 2010
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