Staffordshire Fire and Rescue Service went to an incident at Queen’s Hospital and Hobbycraft, Burton-on-Trent yesterday.
Two fire engines from Longton and one from Burton attended, after four Hobbycraft employees went to the hospital's A&E department after coming into contact with the substance.
The powder was later identified as Napthalene, which is a low risk product, and used to fumigate products shipped from abroad.
More top news
The Conservatives have held Solihull where the Green opposition have gained two seats.
Labour remains in control but lost two seats to the Conservatives.
Labour have lost Dudley to No Overall Control. It had been seen as a vulnerable council for the party.