Ring spinning system is used to produce high-quality yarn, and a wide diversity of yarn styles, but suffer from a low productivity rate. On the other hand, the air vortex spinning is a promising method of new yarn spinning techniques due to its very high speed, but the yarn quality still needs to be investigated from different aspects. The purpose of the study is to compare the color fastness and colorimetric properties of air vortex and ring spun yarns to analyze the difference of these two yarns when only the dyeing properties of them are considered. Therefore, three reactive dyes were applied at different omf (on mass of fabric) depth of shade to the fabrics which are produced from air vortex and ring spun yarns. The results show that, in general, the color fastness values of the air vortex yarn are good as much as to that of ring spun yarn. Also, the examination of color coordinates of undyed and dyed samples on CIELAB color space show that L*, C* and K/S values of both fabrics are similar.
