Elemental chlorine free

Elemental chlorine free (ECF) is a technique that uses chlorine dioxide for the bleaching of wood pulp. It does not use elemental chlorine gas during the bleaching process and prevents the formation of dioxins and dioxin-like compounds, carcinogens. The traditional ECF sequence is DEopDEpD{{citation

|url=http://www.paperenvironment.org/PDF/chcompounds/CC_Full_Text.pdf |title=Different Bleaching Configurations |publisher=National Council for Air and Stream Improvement |year=2009}}{{rp|14}} using the common letter symbols for bleaching stages,{{cite web|url=http://www.paperonweb.com/bleach.htm|title=PaperOnWeb description of bleaching sequences|access-date=2007-09-17}} though many improved sequences are available.{{rp|15}}

Totally chlorine free (TCF) is paper that does not use any chlorine compounds for wood pulp bleaching.