Store at 2° to 8°C (35° to 46°F). Do not freeze. Discard product if exposed to freezing. Protect from light. Tuberculin PPD solutions can be adversely affected by exposure to light. The product should be stored in the dark except when doses are actually being withdrawn from the vial. A vial of TUBERSOL which has been entered and in use for 30 days should be discarded. Do not use after expiration date.