The nerve agent used to poison former spy Sergei Skripal and his daughter Yulia was delivered “in a liquid kind”, the Division for Atmosphere says.
The pair have been found unconscious on a bench within the Wiltshire metropolis of Salisbury on four March.
Yulia, 33, left hospital earlier this month. Her 66-year-old father is alleged to be recovering extra slowly.
The UK authorities says Russia was behind the poisoning, however Moscow denies any involvement.
The Division for Atmosphere, Meals and Rural Affairs (Defra) has launched additional particulars of the substance used and the efforts being made to decontaminate areas of Salisbury the place it has been discovered.
A “very small quantity” of the Novichok nerve agent was used within the assault, with the substance delivered in a “liquid kind”, Defra stated.
Will probably be cleaned away with caustic brokers and hoardings will go up in public locations within the subsequent few days for the clear as much as start.
9 websites in whole require cleansing, together with ambulance stations, Sergei Skripal’s home, and varied metropolis centre areas, together with Zizzi restaurant and the Mill pub, the place the Skripals frolicked on the day they fell ailing.
The work is predicted to take a number of months.