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51. Slime holes: Slurry, the mixture of water, chemicals and pulp or other fibers used to form paper, can develop clumps of bacteria that turn into slime. A slime spot on the slurry when it is spread out on the screen to make paper will become an irregular hole in the finished paper. On rare occasions, the damaged paper will make it through printing and distribution. Value is in the $25+ range for a small example, but try to find one!
Type 51: The "slime hole" was caused by inadequately mixed chemicals in the paper-making process.
Linn's Article by John Hotchner
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