用低浓度草酸,或工业盐酸溶液,浸洗花岗石,去除岩石中的三氧化二铁之后,将会改变花岗石板面的污秽陈旧之感。若在酸性溶液中再加染料(与花岗石同色),还会使该品种花岗石色调更深。 最初,我们在同一块毛板上试验。粗磨、细磨方法不变,精磨时的两半截分别进行:一半截精磨用水中加草酸和染料,一半截精磨用 The use of a low concentration of oxalic acid or an industrial hydrochloric acid solution to dip the granite to remove the iron oxide in the rock will change the old and dirty stain on the granite surface. Adding a dye (in the same color as granite) to an acidic solution will also make the granite more dark. Initially, we tested on the same board. The coarse grinding and fine grinding methods are the same. The two halves of the fine grinding are carried out separately. One half of the fine grinding is performed by adding oxalic acid and a dye to the water, and the other one is used for half grinding.