Benzidine

Eye contact: Immediately flush with plenty of water. After initial flushing, remove any contact lenses and continue flushing for at least 15 minutes. Assure adequate flushing by separating the eyelids with fingers. (P338)
Skin contact: Wash thoroughly with soap and water. Get medical attention if irritation develops or persists. (P352)
Inhalation: Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical attention. (P340)
Store in a tightly closed container. (P404)
Do not breathe vapor. (P260)
Do not get in eyes, on skin or clothing. (P262)
This product should only by used by persons trained in the safe handling of hazardous chemicals. (P202)
Wash thoroughly after handling. Do not take internally. Eye wash and safety equipment should be readily available. (P264)
Respiratory Protection: If workplace exposure limit(s) of product or any component is exceeded (see TLV/PEL), or a risk assessment shows air-purifying respirators are appropriate, use of a NIOSH/MSHA approved air supplied respirator is advised. Use a full-face respirator with multi-purpose combination (US) or type ABEK (EN14387) respirator cartridges in absence of proper environmental control. Always use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). Engineering and/or administrative controls should be implemented to reduce exposure.