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To lose color or whiten by the action of light; for example, the use of a laser to bleach a fluorescent dye covalently linked to a macromolecule.
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In laundry terms, Apollo Technology's photobleach whitens clothes as they hang to dry in the sun.
While several of today's detergents in line-drying geographies currently use photobleach, the existing molecules work only on water-based stains.