"Bleach activators are compounds that allow a lower washing temperature than would be required otherwise to achieve the full activity of bleaching agents in the wash ...
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liquor. Bleaching agents, usually peroxides, are usually sufficiently active only from 60 °C on. With bleach activators, this activity can already be achieved at lower temperatures. Bleach activators react with hydrogen peroxide in aqueous solution to form peroxy acids, they are a component of most laundry detergents. Peroxy acids are more active bleaches than hydrogen peroxide at lower temperatures (<60 °C) but are too unstable to be stored in their active form and hence must be generated in situ." - (en.wikipedia.org 15.03.2020)