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For many years,

elemental chlorine was used to bleach pulp to make it white and improve paper strength, absorbency and softness. This process created a hazardous by-product which adversely affected aquatic ecosystems throughout the world. Today, most North American and European pulp mills have found alternative, environmentally safe methods for bleaching pulp.
The

PCF

designation indicates that no chlorine or chlorine compounds were used in the pulp and papermaking processes.

PCF

fibers have not been re-bleached with chlorine-containing compounds.