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RE: Newsprint sludge
The sludge that doesn't make the grade is made up of short fibers and
kaolin (clay), which gives the glossy inserts their gloss, in addition to the
ink to which others have replied. Marcal Paper was faced with disposing of
truckloads of the stuff per day. They found that it is highly absorbant
"kitty litter," but rather than sell it in the pet trade, they went even
"greener:" they market it for cleaning up environmental spills. If you've ever used kitty litter to clean up those oil drips in your garage, you know how
effective this is.
Bruce Herrick, Ph.D.