. . "300380378" . "A photographic coating composed of layers of gelatin and tannic acid introduced by Louis-D\u00E9sir\u00E9 Blanquart-\u00C9vrard in 1857 to resolve the problem of image impermanence."@en . "vernis cuir"@en . "leather varnish"@en . . "2013-02-05T20:04:20"^^ . "2013-11-14T14:57:39"^^ .