In the 1920s, Laura Scudder,[29][30][31] an entrepreneur in Monterey Park, California, started having her workers take home sheets of wax paper to iron into the form of bags, which were filled with chips at her factory the next day. This pioneering method reduced crumbling and kept the chips fresh and crisp longer. This innovation, along with the invention of cellophane, allowed potato chips to become a mass-market product.