Creosote that creosote contained a mixture of creosol and guaiacol. Later investigations by Gorup-Besanez, A.E. Hoffmann, and Siegfried Marasse showed that wood-tar creosote also contained phenols, giving it a feature in common with coal-tar creosote. Historically, coal-tar creosote has been distinguished from what was thought of as creosote proper—the original substance of Reichenbach's discovery—and it has been referred to specifically as "creosote oil". But, because creosote from coal-tar and wood-tar are obtained from a similar process and have some common uses, they have also been placed in the same class of substances, with the terms "creosote" or "creosote oil" referring to
Wright's Coal Tar Soap Herbert Cassin Wright (chairman), Ernest Albert Umney (vice-chairman), Ernest Blakesley Layman, James Knight, James Hamerton, and Reginald Edward Conder. Hampshire Museum has four "Coal Tar Vaporizers" made by Wright, Layman & Umney in the early 20th century, and some bill-heads (invoices) which were sent to one of their customers, Messrs Charles Mumby & Co, lemonade manufacturers of Gosport. In 1949 the company sued a trader who used a similar name. The law at the time relating to trademarks was covered by the Trade Marks Act 1938. Case law shows that a similar name is not always certain to lead to