In the late 18th century, Charles Tennant revolutionised the linen trade by creating bleaching powder. Today, Tennants, the company he founded, is owned by the Alexander family and makes and distributes more than 3,000 chemicals across the world, from adhesives to animal feed. The Belgravia-based company also manufactures chemicals in Europe, North and South America, and China. Paul Alexander, 63, is group chairman.
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