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Ageing treatments

This can be achieved by dissolving bitumen-based wood stainer in the last layer of varnish. Undiluted nitric acid may also be applied. This opens the grain. If a greener tone is desired a few grams of iron sulphate can be applied. A fibre hair brush should be used. If varnishing is not desired, the surface can be rubbed with an iron brush and paraffin applied.