Blisters in modern work can usually be pricked or cut with a knife along the grain and relaid (see Veneering, marquetry and inlay, Chapter
32) but large blisters in old thick saw-cut veneers may not readily respond to treatment. If the whole of the veneered surface has to be lifted off and replaced on a fresh groundwork, it may be possible to lift the veneers by steaming or repeatedly swabbing with hot water. Some veneers may be too tough or too brittle for this treatment, and the whole of the ground may have to be planed off down to a level at which the water will soak through the back and loosen the glue. This latter method is only worth the very considerable labour involved if the top surface is especially valuable, and the patina of age must be preserved.
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