This London firm traces its origins to 18th-century Glasgow, when founder Charles Tennant began to make bleach, revolutionising the linen trade. The factory became one of the largest chemical works in the world and part of the business became the basis of ICI. Now owned and run by the Alexander family, Tennants supplies more than 1,000 products, including inks, dyes, adhesives, vitamins and water-treatment compounds in Europe and Canada. Sales reached £290.4m in 2007.
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