... white crystal stone3.brand name:montary4.material:natural quartz5.place of original:china6.color:super white and shine,no any color ... clean by water, also you can use below cleansers. type of infectants cleanserTea, coffee ice cream, fat NaOH.KHCO3 watery ... acidic liquid,oxalic acid best for inkOil paint, drawing pen oil of turpentine, acetSauce, wax, carbon powder acidic or alkalic liquidWatery ...