The type of fiber can be determined by microscopic, chemical, or instrumental tests either when found individually or as part of a fabric. Synthetics, like polyester, nylon, etc., constitute the majority of fibers used in the U.S. today. Wools, camel hair, and silk are examples of fibers from animal sources. Cotton, linen, hemp fibers, and jute are examples of plant fibers. The wood fibers in paper are also fibers of vegetable origin.
Asbestos is a mineral fiber.
Comparisons of fibers of the same type of material include the presence of dyes and a number of microscopic features. Comparisons can be made with fibers from a fabric to individual fibers or from fibers removed from another piece of fabric. A fiber match, however, constitutes only class evidence. The weave pattern of fabrics can also be compared, and sometimes, when a piece has been torn from a fabric, that piece can be matched up with weave pattern and irregularities of a mutual tear edge. This is a example of individual characteristics.