 Gaskell's three sons, Holbrook II, James Bellhouse Gaskell and Frank Gaskell all became partners in the company.In 1860 when the governments of Britain and France formed a treaty to raise duties on materials made from salt, Holbrook Gaskell went with Edmund Knowles Muspratt to Paris to negotiate terms for the manufacturers.Gaskell remained a director of the company until 1890 when it became part of the United Alkali Company.