Towards the end of the 19th century aniline dyes were introduced to speed up the process of colouring. These synthetic dye colours left a horrifying result; sharp colours which bleached quickly put the carpets in bad daylight.
The authorities introduced hard punishments to stop the use of these dyes. Nasser-e-Din Shah, the Persian king of the Qajar-dynasty forbide the use of these colours in 1903. Besides prohibition on importing these colours dye-houses were torn down and the weaver could loose an arm.
There are a lot of disadvantages in using aniline dyes. In comparison to the plant dyed yarns, the aniline dyed yarns are not sun- or washproof. The wool also tends to be stiffer and dryer, because the fat in the wool disappears and a result of this is making the woolfibre break when it's disposed to weigh.
A simple tip to see if aniline dyes are used in a carpet is to fold the pile. If all the pile has the same colour it is most likely to be natural dyed yarn. But, if there is a great difference in the colour where the top is much lighter than the bottom of the pile, there's a risk that aniline dyes have been used in the manufacturing process.
However, aniline dyes are not used in new carpets and the aniline dyed carpets on the market today are most likely already bleached so the risk of being affected is very small.
Aniline , C6H5NH2, also called phenylamine, in a pure condition, a colourless fluid produced by reduction of nitrobenzene. The aniline dyes are furthermore an element of tar-colour consisting of organic, synthetic elements. These are extracted from aniline, toluidines or aniline oils, which are extracted from pitcoal tar.
Plant and natural dyes
Colouring yarn is a true art and there are many different ways of doing this.
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Using minerals to dye yarn is not a new invention and is used in certain extent in the carpet manufacturing.
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