A New Staining Technique for the Study of Skin,and Core of Nylon Yarns

Abstract

A new technique for the differential staining of skin and core structure of nylon 6 and 66 yarn cross-sections has been developed. The technique requires the use of two water-soluble dyes, Kiton Pure Blue V, an acid dye, and Methyl Violet 2B Supra I, a basic dye. With these two dyes there is no chemical swelling of the cross-section as with ZnCl₂, iodine staining. Also the skin of an undrawn filament, which is reported by some investigators to be undetectable, can be stained.