This selection of objects consists of an unfinished ivory imitation comb, a roughly circular disc, a lithographic block stained green on one surface from ink and an ivory coloured letter pres mould. Parkesine is thought to have been the first plastic, a mouldable cellulose nitrate which was invented by Alexander Parkes (1813-1890). It was made of cotton fibres disolved in nitric and sulphuric acids, and mixed with vegetable oil. It was softened by heat and then moulded or hand carved. Parkesine's great disadvantage, however, was its high flammability. Although Parkes took out a number of patents for his newly discovered material in 1855, it was not until the Hyatt brothers of New Jersey developed it into celluloid that its commercial potential began to be realised.
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