The army bomb disposal team was called to a school to destroy chemicals which had become unstable.
The "2.4-dinitrophenylhydrazine" substance, better known as "Brady's Reagent", was found at a school in Ennis, Co Clare, at about midday.
It is understood the substance belonged to the school’s science lab.
The bomb disposal team arrived at about 12.15pm and moved the chemical to a nearby green field site where it was destroyed with a controlled explosion.
“Brady’s Reagent” is a substance routinely used in laboratories throughout the country. It becomes hazardous over time.
Later, the disposal team was dispatched to the Roxboro area of Limerick City to dispose of two pieces of historical ammunition, from the 18th and 19th centuries, which had been found by workers on a building site.
