Scientists in the US have developed a new coating they say not only adds water-repellency to natural fabrics such as cotton and silk, but is also more effective than existing coatings.

Scientists in the US have developed a new coating they say not only adds water-repellency to natural fabrics such as cotton and silk, but is also more effective than existing coatings.
Scientists in the US have developed a new coating they say not only adds water-repellency to natural fabrics such as cotton and silk, but is also more effective than existing coatings.