A 14-year-old girl has been arrested after a boy was splashed with chemicals at a school in Darlington.
The headteacher of Longfield Academy said the boy was splashed with a solution containing iodine, bromine and chlorine.
He was taken to hospital as a precaution after teachers washed his face with cold water.
Durham Police subsequently arrested a 14-year-old girl on suspicion of causing actual bodily harm and she was released pending further investigation.
Nick Lindsey, the school’s headteacher, said the incident occurred after an argument during a chemistry lesson on 23 January.
He added that the chemical solution is used as part of the Key Stage 4 curriculum.
He said: “Staff reacted quickly and appropriately and we have received an email from the boy’s mother, thanking us for the ‘professional, thorough and caring’ way it was dealt with.”
The girl will be disciplined by the school.
The three chemicals are not highly acidic on their own, but can be harmful in certain solutions. They do not react with one another.