A Semi-Micro Technique for the Extraction and Comparison of Dyes in Textile Fibers

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Abstract
Solid dye samples and extracted dyes from semi-micro samples of textile fibers are separated by using thin-layer chromatography. The extraction process is nondestructive, leaving the fibers intact for further analysis or court presentation. Acid, basic, disperse, vat, direct, and reactive dyes are used in this study. No single solvent system was found that would successfully separate all of these usage classes of dyes, necessitating the introduction of a screening solvent system. The behavior of the dyes in the screening solvent system gives the criminalist an indication of the usage class of dye being examined. Subsequent separation of the dyes is then carried out in appropriate solvent systems. The procedure is a general one that has been used successfully on a variety of natural and synthetic fibers.

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