Robert Taggart HallRobert Taggart Hall was owner and sometime-president of The Hall China Company in East Liverpool, Ohio, US.Single-fire at Hall ChinaWhen Robert Taggart Hall took over the running of Hall China in 1904, he was determined to develop a single-fire range. Together with staff chemists and ceramic engineers, he experimented over seven years. Finally, in 1911, Hall and his staff were successful.Lead-free ware by accidentInadvertently, Hall China developed a completely lead-free glaze. This was due not to particular health or environmental considerations, but that lead wouldn't survive the high firing temperatures required of their single-fire process.