process they will not interfere with later Bleaching The pulp produced up to this point in the process can be bleached to produce a white paper product. The chemicals used to bleach pulp have been a source of environmental concern, and recently the pulp industry has been using alternatives to chlorine, such as chlorine dioxide, oxygen, ozone and hydrogen peroxide. Step 6 Paper making The fibres are mechanincally treated to make them bond better to each other strengthening the paper), chemicals added to provide special properties such as colour or water resistance, and then the wateris squeezed out and the pulp is rolled smooth and dried 45