Hazard class: Acute toxicity, oral (Category 4). Harmful if swallowed (H302). Do not eat, drink or smoke when using this product (P270). Hazard class: Acute toxicity, dermal and inhalation (Category 5). May be harmful in contact with skin or if inhaled (H313+H333). Hazard class: Serious eye damage or irritation (Category 1). Causes serious eye damage (H318). Hazard class: Germ cell mutagenicity and Reproductive toxicity (Category 2). Suspected of causing genetic defects and of damaging fertility or the unborn child (H341+H361). Obtain special instructions before use (P201). Do not handle until all safety precautions have been read and understood (P202). Use personal protective equipment as required (P281). Hazard class: Carcinogenicity (Category 1B). May cause cancer (H350). Phenolphthalein is categorized as "Reasonably anticipated to be a human carcinogen" by the National Toxicology Program (first listed in 2000).