Iron ore
In cast iron sulfur promotes the formation of white iron. As little as 0.5% can counteract the effects of slow cooling and a high silicon content . White cast iron is more brittle, but also harder. It is generally avoided, because it is difficult to work, except in China where high sulfur cast iron, some as high as 0.57%, made with coal and coke, was used to make bells and chimes . According to , good foundry iron should have less than 0.15% sulfur. In the rest of the world a high sulfur cast iron can be used for making castings, but will make poor wrought iron.
List of cast-iron cookware manufacturers
With the exception of Lodge Manufacturing, most American manufacturers of cast iron from this era such as Atlanta Stove Works, have been acquired by other corporations and no longer produce cast-iron cookware in the United States; however, cast-iron pots and pans from the early 20th century continue to see daily use among many households in the present day. They are also highly sought after by antique collectors and dealers. Among the rarest products were those produced in 1920. Exporting and trade flourished creating a shortage for U.S. consumers. The Atlanta 32 box became one of the rarest items in 1920 production. Exporting overseas created an increase in industry output for the following years. Manufacturing and industry contributed to the prosperity and growth of an era that would be known as the "Roaring 20's" marking a post-war national lifestyle change.Founded as the Seldon and Griswold Manufacturing Company, the Griswold company became known as the premier manufacturer of high-quality cast-iron kitchen items in the United States. The Griswold cast iron foundry was based in Erie, Pennsylvania; and until the early 1900s cast-iron items from this company were marked with an "ERIE" logo. In the early 1900s this was changed to a "GRISWOLD" logo, and it is this logo that is most commonly associated with Griswold cast-iron cookware.