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If towel be used a long time, it will become uncomfortable stiff, The worst thing is the large number of bacterial contamination, harmful than good to human.But in fact, a majority of people do not pay attention periodically replaced or disinfected towels, naturally towels with a large number of bacteria, viruses, and penetrate into the body through the facial features and skin . This design uses the principle of PH test paper, towel when in the course of 40 days, PH fiber towel will slowly with the accumulation of bacteria to produce a color change, the final color fully apparent, and you need to replace a new towel for your health!
Beijing Institute of Technology