Washing efficiency of detergents were investigated by measuring of surface reflectance after cotton fabrics soiled in bath which consist of carbon black, palmitic acid, liquid paraffin and carbon tetrachloride were treated in Laundry-tester. Detergents used were soaps and synthetic detergents being on the marketing. Results of this study indicate that soaps were superior to synthetic detergents. Washing continued three times repeatedly in the same bath and washing in the bath which is kept for 24 hours after one washing, both of the washing efficiencies are found no appreciable change.
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