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What was the first large-scale industrial use of chlorine?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — halogen Modern version of the periodic table of the elements.

The first large-scale industrial use of chlorine was in the manufacture of bleaching powder for the paper and cotton textile industries.1

Introduced in 1799 by the Scottish chemist Charles Tennant, bleaching powder—a solid combination of chlorine and slaked lime—provided a more stable and easily transportable form of chlorine compared to the gas itself. This innovation allowed for the widespread industrial application of chlorine's whitening properties, which remained the standard for bleaching until the 1920s, when it was gradually superseded by liquid chlorine and sodium hypochlorite solutions.21