Another major technological development was the introduction of " natural color ," which meant color that was photographically recorded from nature rather than added to black-and-white prints by hand-coloring, stencil-coloring or other arbitrary procedures, although the earliest processes typically yielded colors which were far from "natural" in appearance. [ citation needed ] While the advent of sound films quickly made silent films and theater musicians obsolete, color replaced black-and-white much more gradually. [ citation needed ] The pivotal innovation was the introduction of the three-strip version of the Technicolor process, first used for animated cartoons in 1932, then also for live-action short films and isolated sequences in a few feature films , then for an entire feature film, Becky Sharp , in 1935. The expense of the process was daunting, but favorable public response in the form of increased box office receipts usually justified the added cost. The number of films made in color slowly increased year after year.