Chromolithography was the first method for making true multi-color prints. (Before the chromolithograph, prints were colored in by hand.) First commercialized in the 1830s by Godefrey Engleman of France, it was based on lithography which used flat stone slabs on which an image is drawn on the surface, but used separate stones for separate colors or impressions. Later, zinc plates were used. Offset printing replaced chromolithography around the 1930s.