You can do a fibre burning test. Unravel several warp and weft yarns. Using tweezers hold the yarn to the edge of a flame. Observe the changes. Which of the following is/are correct ?
i) If it smells like burning hair, the yarn is wool or silk
ii) If it smells like burning paper, the yarn may be cotton or rayon
iii) If the yarn melts in the flame, it is a synthetic fibre such as nylon and acrylic