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  : 14 using the common letter symbols for bleaching stages,  though many improved sequences are available.  : 15
Totally Chlorine Free (TCF) is a paper that does not use any chlorine compounds for wood pulp bleaching.
- Environmental issues with paper
- ^ Jump up to:a b Different Bleaching Configurations (PDF) , National Council for Air and Stream Improvement, 2009
- Jump up^ „PaperOnWeb description of bleaching sequences“ . Retrieved 2007-09-17 .