Woodworm affected wood is carefully stripped of wood flour by Biancha. The channels are then injected one by one with glue. As a result, the wood gets about 70 to 80 percent of its strength back. It is always a big challenge to find matching veneer. It is preferable to use Biancha veneer of the same age and similar drawing. The thickness of veneer must also match. In the past, sawn veneer was used. Nowadays it is planed, so that even thinner veneer is possible. Polishing is still done manually. "That gives the best result," says Alexander. Machine polishing produces an 'orange peel', something that Alexander wants to avoid at all costs. The seventeenth-century bureau of rosewood came into the deplorable state. Due to years of low humidity the bone glue was completely dried out. Pieces of veneer were missing and structural parts were strongly affected by woodworm. Now, after restoration, the furniture can last for at least eighty years.