Discussion
Internal sizing of paper is done to
Answer: D
Correct answer: control penetration of water and ink
Cellulose fibres are hydrophilic, so an unsized sheet wicks liquid like blotting paper. Internal sizing adds a hydrophobic agent to the stock so that water and ink stay on the surface long enough to be controlled - which is what allows printing without feathering and writing without spreading. It does not affect brightness, thickness or lignin.
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