Paper is a naturally absorbent material. Sizing reduces this absorbency to lessen or prevent bleeding and feathering of watery media. Sizing also protects the fiber from oily media as well as dirt & pollution. Twinrocker sizing is an alkylketene dimer, often called just "dimer", in concentrated liquid form. It is used by simply diluting it in water and adding it to the pulp before or after coloring.
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