this crystallized glass,also named white crystallized glass panel, it's pure white,shine, no color difference,used on floor,wall 1.model ... and 30mm13.packing:wooden case,seaworthy wooden crate.14.crystallized glass qualification: flatness 0.5%(max) thickness +/-1mm air hole ... .HNO3.H2SO4 watery acidic liquid,oxalic acid best for inkOil paint, drawing pen oil of turpentine, acetSauce, wax, carbon powder ...