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The gloss of fabrics is subjectively evaluated. With a Goniophotometer it is possible to measure the gloss more exactly. Newly, the gloss of textiles, including the color, can be determined according to a DWI method. The use of scanning electron microscopy (SEM) allows showing the reasons of gloss after wearing textiles as well as the way it may be influenced by the quantity and distribution of applied nanoparticles. Gloss complaints occur mostly with dark clothing from, or with wool. Gloss during wearing textiles is generated preferably by rubbing to smooth and, when indicated, warm surfaces. Gloss from wearing cannot be reproduced reliably with the Martindale abrasion tester. At DWI the authors succeeded in obtaining gloss with a rotating ceramic roller after only 15 min. In this way the manufacturers of finishing agents can examine the effectiveness of their products, and manufacturers of textiles, as well as garment makers, can test the fabrics for their susceptibility to gloss. Test equipment manufacturers receive also strong impulses for new developments. Nanoparticles with positive zetapotential, like boehmite, can bind to wool from aqueous solutions with low electrolyte content. Finishing agents and textile manufacturers as well as garment makers and chemical cleaners know by now that matting finishing agents for dark wool must be dark, or color neutral, and that it should be paid attention to the hand and abrasion resistance of the end-product. The adherence of particles to fibers is important, too. Possibly larger particles than 200 nm can lead to success.