Daum is a crystal studio based in Nancy, France, founded in 1878 by Jean Daum (1825–1885). His sons, Auguste Daum (1853–1909) and Antonin Daum (1864–1931), oversaw its growth during the burgeoning Art Nouveau period. During the Universal Exhibition of 1900 Daum was awarded a ‘Grand Prix’ medal. Daum glass became more elaborate, acid etching (by Jacques Gruber) was often combined with carving, enamelling and engraving on a single piece of glass to produce creative glass master-pieces.[citation needed] The most complicated creations also feature applied glass elements, such as handles and ornamental motifs in naturalistic forms. The Daum brothers quickly moved on to become one of the major forces in the Art Nouveau movement, seriously rivalling Galle, so much so that when Galle died in 1904 they became the leaders in the field of decorative glass.