 A number of chemists also swore that even if he had analysed Goodyear's material, this would not have given him enough information to duplicate the process.Alexander Parkes, inventor of the "cold cure" process (vulcanisation of fabrics using sulphur chloride in a carbon disulphide solution), claimed that both Hancock and Brockendon admitted to him that their experiments on the Goodyear samples had enabled them to understand what he had done.The firm had large display stands at the Great Exhibition of 1851 in London and at the 1855 Exposition Universelle in Paris.