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Laundry detergents were traditionally supplied as solids, in bars or as granular powders. It was not until the 1960s that liquid laundry detergents were launched in the United States. Since then, they have come to overwhelmingly dominate the U.S. market. Their market share in Europe varies: In countries of Northern Europe, liquids capture a mere 10-20 percent of sales -- but in the Mediterranean countries, liquid holds at least half the market, and its popularity is still growing. This eBook lays out the differences in ingredients between solid and liquid detergents, and the properties of each medium. Purchasing, storing and washing behaviors of U.S. and European consumers are compared, including the surprising popularity of polyvinyl alcohol (PVA) capsules for timed release of liquid detergents. It also reviews soluble additives such as enzymes, bleaches and why bleach activators work well in powdered detergent while being problematic in liquid detergent. Development of liquid detergents is continuing against a backdrop of major changes, in particular new environmental regulatory obstacles. In response, manufacturers are improving their production processes and looking to replace synthetic petrochemical-derived ingredients with those obtained from renewable natural resources. The eBook also posits how future improvements in washing machine technology could impact detergent development.