 Nitroglycerine was also produced in the factory, and the group also intended to make hydrocyanic acid from potassium cyanide, initially purchased in weak form from Gupta and later in a stronger concentration from elsewhere.The revolutionaries knew that hydrocyanic acid produced a very toxic gas and that an antidote would need to be available if those manufacturing it were not to suffer.It was the inability to procure an antidote that caused them to abandon the attempt.