Department sources said 900 kg was seized from a shop in Selvapuram and 720 kg from a godown in R S Puram. Sodium Hydro-sulphide above permitted level was used to make the jaggery appear more attractive in colour, they said.
Samples have been sent for tests and based on the results, cases would be registered against the owners, they said.
The department had yesterday seized 1.5 tonnes of adulterated tea from a shop in Chinnavedapatti on the outskirts during a routine check, did a spot check and confirmed it and registered a case against the owner.