In 1882 Demachy was elected to the Société Française de Photographie; in 1888 he formed the new Photo-Club de Paris with Maurice Bucquet, similar to the Photo-Secession in the United States; 1894 he began to use the gum bichromate printing process recently introduced by A.Rouillé-Ladevèze at the Paris Salon; 1895 he had his first exhibition of gum prints at the Photo-Club de Paris, also in 1895 he was elected to the Brotherhood of the Linked Ring; 1897 he published his first book, with co-author Alfred Maskell, Photo-aquatint or Gum Bichromate Process