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In page Quipu:

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Quipus are made of fibers, either spun and plied thread such as wool or hair from alpaca, llama, guanaco or vicuña, though are also commonly made of cellulose like cotton. The knotted strings of quipus were often made with an "elaborate system of knotted cords, dyed in various colors, the significance of which was known to the magistrates".[1] Fading of color, natural or dyed, cannot be reversed, and may indicate further damage to the fibers. Colors can darken if attacked by dust or by certain dyes and mordants.[2] Quipus have been found with adornments, such as animal shells, attached to the cords, and these non-textile materials may require additional preservation measures.