It is a mild irritant. It must be handled with care. It will cause severe burns to exposed skin and eyes and can cause severe respiratory and gastrointestinal disorders. The vapour is also a severe irritant and corrosive. Always add acid to water and never water to acid.
Heat is generated by the reaction which can be violent.
It is highly toxic when inhaled or ingested. It is an eye irritant and can be absorbed through cuts and abrasions. Its effects upon humans have not been quantified. Other dyes in this group are known to be very toxic and potential carcinogens. Handle with care.