Advert for Calvert's Dento-Phenolene, 1890s.
Licence: Public Domain Mark
Credit: Advert for Calvert's Dento-Phenolene, 1890s. Wellcome Collection. Source: Wellcome Collection.
Licence: Public Domain Mark
Credit: Advert for Calvert's Dento-Phenolene, 1890s. Wellcome Collection. Source: Wellcome Collection.