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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

From: Safeguarding our dentistry heritage: a study of the history and conservation of nineteenth–twentieth century dentures

Fig. 2

A Raman spectra of a cellulose nitrate reference (Amersham™Protran® membrane), camphor (96%, Sigma-Aldrich) and celluloid (cellulose nitrate + 30% wt camphor). B Cellulose nitrate and camphor chemical structures. Cellulose nitrate is showed with a degree of substitution 2 (on average, two nitrate groups and one hydroxyl group per monomer). 2. C Raman spectra of vermilion (HgS, mercury sulfide) and zinc oxide (ZnO), also known as zinc white

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