Shell vials are flat-bottomed vials used for making color comparisons among liquid substances. They are not intended to have a cap. If you wish to cap this vial, use a rubber stopper, cork or Parafilm. They come in three sizes.
Soft glass (not borosilicate) vial with a flat bottom. Vial lip is fire polished and smooth. Not intended to have a cap. If you wish to cap this vial, use a rubber stopper, cork or Parafilm (Flinn Nos. AP1500, AP1501, AP1502).