Natural materials are the original source for the dyeing of wool. Even today, many Persian rugs are still dyed from natural materials. It is very complex and can take up to fourteen days until the desired colour has been achieved. In comparison to chemical dyes, natural dyes give the wool a shine that can hardly be surpassed. In addition, the dyestuffs are absolutely harmless and are very popular again.Mineral, aniline and chrome dyes have recently been included in the process of dyeing, as they came onto the market as improved synthetic paints and are largely similar to natural paints. They have a somewhat more artificial gloss compared to natural colours, which only become softer over the years.