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Different Tracer Stain Systems for Testing Laundry Detergent Performance

Abstract A wide range of test methods are used worldwide for testing the performance of laundry detergents. Principally, all methods need tracer stains. Uniformly stained standard tracer stains are occasionally considered ‘artificial’ while manually prepared or circular stains are at the same time accepted as ‘natural’. This distinction is not helpful, it is even incorrect. Uniformly stained tracer stains were developed to improve reproducibility. Only few existing stains are additionally heat treated or represent combinations of several stain substances ((effect stains)). All tests are supposed to provide performance results reflecting reality (i. e. consumer perception); suitability of any of the model systems depends solely on their ability to provide results for reliable performance assessment. Extensive comparative tests using different stain systems confirmed that preparation of small batches using different fabric substrates, finish and pre-treatment is beneficial for testing e. g. soil release polymer performance. Apart from that, uniformly soiled standard stains in general showed better reproducibility while providing comparable performance results. We could confirm that standard stains are a good solution for addressing issues with dissatisfactory reproducibility.