Synthetic Dyes
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Aniline dyes were speedily adopted in the carpet industry due to their low cost and easy-to-use characteristic. The use of them was not limited to a specific area but spread throughout the world. In the last years of the nineteenth century aniline dyes were strongly acidic which damaged the quality of the rug by destroying the natural oil in the wool causing the rug to wear off in no time. In addition, the colors ran when the kilim was washed or faded if the rug was exposed to sunlight. Because of these problems, aniline dyes are not used as much as they used to be. Nowadays they are used in the dyeing of inferior quality rugs.If you do not know whether your precious kilim or persian style rug was aniline dyed. You should rub a damp cloth over the pile. If the rug was dyed with a good-quality vegetable or chemical dye it will not rub off onto the cloth, but if it does then your rug has been dyed with aniline.
