Tracer Fiber Technique

Tracer Fiber Technique was invented by Morton and Yen. Here a small proportion of colored fiber (less than 1%) add to the stock from which the yarn is spun. It is essential that the properties of the colored fibers should by identical or almost identical with those of the main stock of uncolored fibers then the colored and uncolored fibers are twisted together to form yarn. This yarn is immersed in a liquid of the same refractive index as the fibers. As a result, the uncolored fibers in yarn become almost transparent, where as the colored can be easily seen. Now the fiber in the yarn is observed in a micro projection and thus migration is measured.

tracer fiber technique

Here the colored fiber is called Tracer Fiber.