Forms in Solution with Metal Salts, Photoetchant d. High by all routes of entry - all forms are highly corrosive to skin and mucous membranes produce severe damage which may fake months to heal.
Fumes can cause permanent damage to cornea of eyes.
Exposure in all forms can cause death. Inhalation can cause death. Wear appropriate clothing such as rubber gloves and face shield. Use fume hood. Avoid breathing fumes.