Wash inner vials (Glass Vials, Inc., 11.5 x 35 mm) and stopper with an oil-free cotton plug. Subsequently, label each vial and autoclave. Prepare outer vials (Glass Vials, Inc., 14.25 x 85.0 mm) by placing a small amount of silica gel granules (Fisher Scientific, grade 42, 6-16 mesh) in the vials to cover about half the bottom.