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Coming late into this discussion, I may have missed a thing or two (often
do). Is the use of bleach for preservation or for whitening? I don't often
read of people hammering on the pulp, but that's the best way to release
the celulose in plant material (probably wouldn't work so great with toilet
paper). This is also the best part of papermaking for my students! They sit
around with boards and hammers or sticks and pound away. They are astonised
at the difference in color between pounded and unpounded pulp, the pounded
pulp being very white or light colored, thereby eliminating the need for
bleach as a whitener. I have samples of stinging nettle pounded and
unpounded the former being brown and the latter, pure white. But who wants
to make a white piece of paper anyway?