1. Dyeing and Chemical Technology of Textile Fibres;Trotman,1975
2. Modern textile dyeing takes note of the environment;Nousiainen;Kem-Kemi,1997
3. Health and safety aspects;Hunger,2003
4. http://ec.europa.eu/environment/chemicals/reach/reach_intro.htm.
5. http://www.unece.org/trans/danger/publi/ghs/ghs.