electroplate and coating outside,no light go through,15ml,glass we are specializing in glass bottle,pls contact us for more information.1.outer side of glass bottle can be painted,coated,printed2.can be used by color glass material for glass bottle,such as white glass,more protect for sunlight partmaterialnotecapppwith brushbottleglass 15ml square 15/410 neck size glass painted glue bottle