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of City Chambers, Leeds, Yorks. Telephone: Leeds 20024 (5 lines). Cables: "Brotherton, Leeds". (1929)
Ditto Address and Cables. Telephone: Leeds 29321. (1947)
1890 Partnership dissolved. '...the Partnership heretofore subsisting between the undersigned, George Dyson, Frederick Dyson, Edward Allen Brotherton, and Herbert Dyson, carrying on business at Wakefield and Leeds, in the county of York, as Manufacturing Chemists, was dissolved as and from the 30th day of June, 1889; since which date the same business has been continued by the said Edward Allen Brotherton on his own account...'
Developed other opportunities for the sale of ammonia, supplying the textile industry and becoming associated with the Cassel Cyanide Co
1902 Became a limited company; said to be the largest private chemical company in the country.
Expanded into coal-tar distillation, and the treatment of its organic by-products.
WWI Manufactured a range of primary and secondary coal-tar products - pitch, creosote, naphthalene, anthracene, TNT, and picric acid (an important explosive).
Purchased the Mersey Chemical Co., which had been German-owned, and extended the company's interests into the production of both inorganic materials (sulphur dioxide and oleum) and synthetic dyestuffs.
1924 On the death of Sir George Beilby, Brotherton became chairman of Cassels.
1929 Listed Exhibitor. Manufacturers of Ammonia Liquor (all strengths), Carbonate and Bicarbonate of Ammonia, Coal Tar Products, Dyestuffs and Intermediates, Liquid SO₂, Sodium Bisulphate, Sodium Hydrosulphite and its derivatives, Formosul, Zinc Formosul, Leucotropes. (Stand No. K.69) 
1930 Death of Edward Brotherton
1936 Hydrosulphates for the textile industry. 
1947 British Industries Fair Advert as Manufacturers of Ammonia, Chemicals and Dyestuffs including: Sodium Hydrosulphite, Formosul, zinc Formosul, Redusol, Laundros. Sulphur dioxide. Leucotropes, Metachrone, Direct and Acid Dyestuffs. Ammonia Liquor. Ammonium Carbonate, Bicarbonate. Sodium Sulphite, Bisulphite, Metabisulphite, Hexamine, Sulphuric Acid, Coal Tar Products. (Chemicals Section - Olympia, Ground Floor, Stand No. A.1253) 
1956 Brotherton House was opened as the head office.
1963 The premises were bought by Leeds City Council for use by the police.