People should be aware that it can hardly clean away the rust of the surface by muriatic or oxalic acid, even the inner of stone going worse and to be more rusty.

• 在那种情况下，清洁和保养是十分必需的。人们会发现用盐酸或草酸很难清洗表面的锈迹，甚至宝石里面变得更差或更锈。