https://www.1stdibs.com/furniture/wall-decorations/posters/original-antique-poster-cellemail-le-premier-email-froid-francais-enamel-paint/id-f_23460472/ https:/

https://www.1stdibs.com/furniture/wall-decorations/posters/original-antique-poster-cellemail-le-premier-email-froid-francais-enamel-paint/id-f_23460472/ https://www.1stdibs.com/furniture/wall-decorations/posters/o... " Cellemail le premier email a froid Francais / Cellemail the best French cold enamel " So, I think it's french for enamel? Based on that link.