A variety of other systems, such as catechols, glycols and boron compounds, has been the subject of patents or has been the subject of patents or had been released for commercial sale. Both the Toppan Printing Company and the Mitsubishi Gas Chemical Company have developed ascorbic acid-based sachet systems from use where fast oxygen absorption is required in the presence of carbon dioxide. Generally these compositions are non-metallic, and do not place restrictions on the use of metal detectors on packaging liner.