DYEING NYLON WITH INDIGO IN VARIOUS PH REGIONS
http://www.autexrj.com/cms/zalaczone_pliki/4_325.pdf
The dyeing of polypropylene fibers in supercritical fluid
http://finechem.dlut.edu.cn/05icfm/article/review/the%20dyeing%20of%20polypropylene%20fibers%20in%20supercritical%20fluid.pdf